[PATCH v2 net-next 1/3] filter: refactor BPF JIT for seccomp filters

From: Xi Wang
Date: Fri Apr 26 2013 - 22:19:01 EST

Currently, bpf_jit_compile() and bpf_jit_free() take an sk_filter,
which seccomp filters cannot reuse.

Change bpf_jit_compile() to take a pointer to BPF instructions and
an instruction length, and to return a JITted function.

Change bpf_jit_free() to take a JITted function.

Add JIT calls for seccomp filters.

Signed-off-by: Xi Wang <xi.wang@xxxxxxxxx>
Cc: Daniel Borkmann <dborkman@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Will Drewry <wad@xxxxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: David Laight <david.laight@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Nicolas Schichan <nschichan@xxxxxxxxxx>
---
arch/arm/net/bpf_jit_32.c | 50 ++++++++++++++++++++---------------------
arch/powerpc/net/bpf_jit_comp.c | 36 ++++++++++++++---------------
arch/s390/net/bpf_jit_comp.c | 31 ++++++++++++-------------
arch/sparc/net/bpf_jit_comp.c | 22 +++++++++---------
arch/x86/net/bpf_jit_comp.c | 21 +++++++++--------
include/linux/filter.h | 16 ++++++++-----
kernel/seccomp.c | 6 ++++-
net/core/filter.c | 6 ++---
8 files changed, 97 insertions(+), 91 deletions(-)

diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index 1a643ee..073b085 100644
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -55,7 +55,8 @@
#define FLAG_NEED_X_RESET (1 << 0)

struct jit_ctx {
- const struct sk_filter *skf;
+ struct sock_filter *insns;
+ unsigned len;
unsigned idx;
unsigned prologue_bytes;
int ret0_fp_idx;
@@ -131,8 +132,8 @@ static u16 saved_regs(struct jit_ctx *ctx)
{
u16 ret = 0;

- if ((ctx->skf->len > 1) ||
- (ctx->skf->insns[0].code == BPF_S_RET_A))
+ if ((ctx->len > 1) ||
+ (ctx->insns[0].code == BPF_S_RET_A))
ret |= 1 << r_A;

#ifdef CONFIG_FRAME_POINTER
@@ -181,7 +182,7 @@ static inline bool is_load_to_a(u16 inst)
static void build_prologue(struct jit_ctx *ctx)
{
u16 reg_set = saved_regs(ctx);
- u16 first_inst = ctx->skf->insns[0].code;
+ u16 first_inst = ctx->insns[0].code;
u16 off;

#ifdef CONFIG_FRAME_POINTER
@@ -279,7 +280,7 @@ static u16 imm_offset(u32 k, struct jit_ctx *ctx)
ctx->imms[i] = k;

/* constants go just after the epilogue */
- offset = ctx->offsets[ctx->skf->len];
+ offset = ctx->offsets[ctx->len];
offset += ctx->prologue_bytes;
offset += ctx->epilogue_bytes;
offset += i * 4;
@@ -419,7 +420,7 @@ static inline void emit_err_ret(u8 cond, struct jit_ctx *ctx)
emit(ARM_MOV_R(ARM_R0, ARM_R0), ctx);
} else {
_emit(cond, ARM_MOV_I(ARM_R0, 0), ctx);
- _emit(cond, ARM_B(b_imm(ctx->skf->len, ctx)), ctx);
+ _emit(cond, ARM_B(b_imm(ctx->len, ctx)), ctx);
}
}

@@ -469,14 +470,13 @@ static inline void update_on_xread(struct jit_ctx *ctx)
static int build_body(struct jit_ctx *ctx)
{
void *load_func[] = {jit_get_skb_b, jit_get_skb_h, jit_get_skb_w};
- const struct sk_filter *prog = ctx->skf;
const struct sock_filter *inst;
unsigned i, load_order, off, condt;
int imm12;
u32 k;

- for (i = 0; i < prog->len; i++) {
- inst = &(prog->insns[i]);
+ for (i = 0; i < ctx->len; i++) {
+ inst = &(ctx->insns[i]);
/* K as an immediate value operand */
k = inst->k;

@@ -769,8 +769,8 @@ cmp_x:
ctx->ret0_fp_idx = i;
emit_mov_i(ARM_R0, k, ctx);
b_epilogue:
- if (i != ctx->skf->len - 1)
- emit(ARM_B(b_imm(prog->len, ctx)), ctx);
+ if (i != ctx->len - 1)
+ emit(ARM_B(b_imm(ctx->len, ctx)), ctx);
break;
case BPF_S_MISC_TAX:
/* X = A */
@@ -858,22 +858,24 @@ b_epilogue:
}


-void bpf_jit_compile(struct sk_filter *fp)
+bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen)
{
struct jit_ctx ctx;
unsigned tmp_idx;
unsigned alloc_size;
+ bpf_func_t bpf_func = sk_run_filter;

if (!bpf_jit_enable)
- return;
+ return bpf_func;

memset(&ctx, 0, sizeof(ctx));
- ctx.skf = fp;
- ctx.ret0_fp_idx = -1;
+ ctx.insns = filter;
+ ctx.len = flen;
+ ctx.ret0_fp_idx = -1;

- ctx.offsets = kzalloc(4 * (ctx.skf->len + 1), GFP_KERNEL);
+ ctx.offsets = kzalloc(4 * (ctx.len + 1), GFP_KERNEL);
if (ctx.offsets == NULL)
- return;
+ return bpf_func;

/* fake pass to fill in the ctx->seen */
if (unlikely(build_body(&ctx)))
@@ -919,12 +921,12 @@ void bpf_jit_compile(struct sk_filter *fp)

if (bpf_jit_enable > 1)
/* there are 2 passes here */
- bpf_jit_dump(fp->len, alloc_size, 2, ctx.target);
+ bpf_jit_dump(ctx.len, alloc_size, 2, ctx.target);

- fp->bpf_func = (void *)ctx.target;
+ bpf_func = (void *)ctx.target;
out:
kfree(ctx.offsets);
- return;
+ return bpf_func;
}

static void bpf_jit_free_worker(struct work_struct *work)
@@ -932,12 +934,10 @@ static void bpf_jit_free_worker(struct work_struct *work)
module_free(NULL, work);
}

-void bpf_jit_free(struct sk_filter *fp)
+void bpf_jit_free(bpf_func_t bpf_func)
{
- struct work_struct *work;
-
- if (fp->bpf_func != sk_run_filter) {
- work = (struct work_struct *)fp->bpf_func;
+ if (bpf_func != sk_run_filter) {
+ struct work_struct *work = (struct work_struct *)bpf_func;

INIT_WORK(work, bpf_jit_free_worker);
schedule_work(work);
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index c427ae3..a82e400 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -31,11 +31,11 @@ static inline void bpf_flush_icache(void *start, void *end)
flush_icache_range((unsigned long)start, (unsigned long)end);
}

-static void bpf_jit_build_prologue(struct sk_filter *fp, u32 *image,
+static void bpf_jit_build_prologue(struct sock_filter *filter,
+ u32 *image,
struct codegen_context *ctx)
{
int i;
- const struct sock_filter *filter = fp->insns;

if (ctx->seen & (SEEN_MEM | SEEN_DATAREF)) {
/* Make stackframe */
@@ -135,12 +135,12 @@ static void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx)
((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset)

/* Assemble the body code between the prologue & epilogue. */
-static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
+static int bpf_jit_build_body(struct sock_filter *filter,
+ unsigned int flen,
+ u32 *image,
struct codegen_context *ctx,
unsigned int *addrs)
{
- const struct sock_filter *filter = fp->insns;
- int flen = fp->len;
u8 *func;
unsigned int true_cond;
int i;
@@ -564,7 +564,7 @@ static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
return 0;
}

-void bpf_jit_compile(struct sk_filter *fp)
+bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen)
{
unsigned int proglen;
unsigned int alloclen;
@@ -573,14 +573,14 @@ void bpf_jit_compile(struct sk_filter *fp)
unsigned int *addrs;
struct codegen_context cgctx;
int pass;
- int flen = fp->len;
+ bpf_func_t bpf_func = sk_run_filter;

if (!bpf_jit_enable)
- return;
+ return bpf_func;

addrs = kzalloc((flen+1) * sizeof(*addrs), GFP_KERNEL);
if (addrs == NULL)
- return;
+ return bpf_func;

/*
* There are multiple assembly passes as the generated code will change
@@ -636,7 +636,7 @@ void bpf_jit_compile(struct sk_filter *fp)
cgctx.seen = 0;
cgctx.pc_ret0 = -1;
/* Scouting faux-generate pass 0 */
- if (bpf_jit_build_body(fp, 0, &cgctx, addrs))
+ if (bpf_jit_build_body(filter, flen, 0, &cgctx, addrs))
/* We hit something illegal or unsupported. */
goto out;

@@ -645,7 +645,7 @@ void bpf_jit_compile(struct sk_filter *fp)
* update ctgtx.idx as it pretends to output instructions, then we can
* calculate total size from idx.
*/
- bpf_jit_build_prologue(fp, 0, &cgctx);
+ bpf_jit_build_prologue(filter, 0, &cgctx);
bpf_jit_build_epilogue(0, &cgctx);

proglen = cgctx.idx * 4;
@@ -661,8 +661,8 @@ void bpf_jit_compile(struct sk_filter *fp)
for (pass = 1; pass < 3; pass++) {
/* Now build the prologue, body code & epilogue for real. */
cgctx.idx = 0;
- bpf_jit_build_prologue(fp, code_base, &cgctx);
- bpf_jit_build_body(fp, code_base, &cgctx, addrs);
+ bpf_jit_build_prologue(filter, code_base, &cgctx);
+ bpf_jit_build_body(filter, flen, code_base, &cgctx, addrs);
bpf_jit_build_epilogue(code_base, &cgctx);

if (bpf_jit_enable > 1)
@@ -681,11 +681,11 @@ void bpf_jit_compile(struct sk_filter *fp)
/* Function descriptor nastiness: Address + TOC */
((u64 *)image)[0] = (u64)code_base;
((u64 *)image)[1] = local_paca->kernel_toc;
- fp->bpf_func = (void *)image;
+ bpf_func = (void *)image;
}
out:
kfree(addrs);
- return;
+ return bpf_func;
}

static void jit_free_defer(struct work_struct *arg)
@@ -696,10 +696,10 @@ static void jit_free_defer(struct work_struct *arg)
/* run from softirq, we must use a work_struct to call
* module_free() from process context
*/
-void bpf_jit_free(struct sk_filter *fp)
+void bpf_jit_free(bpf_func_t bpf_func)
{
- if (fp->bpf_func != sk_run_filter) {
- struct work_struct *work = (struct work_struct *)fp->bpf_func;
+ if (bpf_func != sk_run_filter) {
+ struct work_struct *work = (struct work_struct *)bpf_func;

INIT_WORK(work, jit_free_defer);
schedule_work(work);
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 0972e91..7966e0c 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -738,19 +738,19 @@ out:
return -1;
}

-void bpf_jit_compile(struct sk_filter *fp)
+bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen)
{
unsigned long size, prg_len, lit_len;
struct bpf_jit jit, cjit;
unsigned int *addrs;
int pass, i;
+ bpf_func_t bpf_func = sk_run_filter;

if (!bpf_jit_enable)
- return;
- addrs = kmalloc(fp->len * sizeof(*addrs), GFP_KERNEL);
+ return bpf_func;
+ addrs = kzalloc(flen * sizeof(*addrs), GFP_KERNEL);
if (addrs == NULL)
- return;
- memset(addrs, 0, fp->len * sizeof(*addrs));
+ return bpf_func;
memset(&jit, 0, sizeof(cjit));
memset(&cjit, 0, sizeof(cjit));

@@ -759,10 +759,10 @@ void bpf_jit_compile(struct sk_filter *fp)
jit.lit = jit.mid;

bpf_jit_prologue(&jit);
- bpf_jit_noleaks(&jit, fp->insns);
- for (i = 0; i < fp->len; i++) {
- if (bpf_jit_insn(&jit, fp->insns + i, addrs, i,
- i == fp->len - 1))
+ bpf_jit_noleaks(&jit, filter);
+ for (i = 0; i < flen; i++) {
+ if (bpf_jit_insn(&jit, filter + i, addrs, i,
+ i == flen - 1))
goto out;
}
bpf_jit_epilogue(&jit);
@@ -789,8 +789,8 @@ void bpf_jit_compile(struct sk_filter *fp)
cjit = jit;
}
if (bpf_jit_enable > 1) {
- pr_err("flen=%d proglen=%lu pass=%d image=%p\n",
- fp->len, jit.end - jit.start, pass, jit.start);
+ pr_err("flen=%u proglen=%lu pass=%d image=%p\n",
+ flen, jit.end - jit.start, pass, jit.start);
if (jit.start) {
printk(KERN_ERR "JIT code:\n");
print_fn_code(jit.start, jit.mid - jit.start);
@@ -800,9 +800,10 @@ void bpf_jit_compile(struct sk_filter *fp)
}
}
if (jit.start)
- fp->bpf_func = (void *) jit.start;
+ bpf_func = (void *) jit.start;
out:
kfree(addrs);
+ return bpf_func;
}

static void jit_free_defer(struct work_struct *arg)
@@ -813,13 +814,13 @@ static void jit_free_defer(struct work_struct *arg)
/* run from softirq, we must use a work_struct to call
* module_free() from process context
*/
-void bpf_jit_free(struct sk_filter *fp)
+void bpf_jit_free(bpf_func_t bpf_func)
{
struct work_struct *work;

- if (fp->bpf_func == sk_run_filter)
+ if (bpf_func == sk_run_filter)
return;
- work = (struct work_struct *)fp->bpf_func;
+ work = (struct work_struct *)bpf_func;
INIT_WORK(work, jit_free_defer);
schedule_work(work);
}
diff --git a/arch/sparc/net/bpf_jit_comp.c b/arch/sparc/net/bpf_jit_comp.c
index d36a85e..15e6513 100644
--- a/arch/sparc/net/bpf_jit_comp.c
+++ b/arch/sparc/net/bpf_jit_comp.c
@@ -354,21 +354,21 @@ do { *prog++ = BR_OPC | WDISP22(OFF); \
* emit_jump() calls with adjusted offsets.
*/

-void bpf_jit_compile(struct sk_filter *fp)
+bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen)
{
unsigned int cleanup_addr, proglen, oldproglen = 0;
u32 temp[8], *prog, *func, seen = 0, pass;
- const struct sock_filter *filter = fp->insns;
- int i, flen = fp->len, pc_ret0 = -1;
+ int i, pc_ret0 = -1;
unsigned int *addrs;
void *image;
+ bpf_func_t bpf_func = sk_run_filter;

if (!bpf_jit_enable)
- return;
+ return bpf_func;

addrs = kmalloc(flen * sizeof(*addrs), GFP_KERNEL);
if (addrs == NULL)
- return;
+ return bpf_func;

/* Before first pass, make a rough estimation of addrs[]
* each bpf instruction is translated to less than 64 bytes
@@ -763,7 +763,7 @@ cond_branch: f_offset = addrs[i + filter[i].jf];
pr_err("bpb_jit_compile fatal error\n");
kfree(addrs);
module_free(NULL, image);
- return;
+ return bpf_func;
}
memcpy(image + proglen, temp, ilen);
}
@@ -799,11 +799,11 @@ cond_branch: f_offset = addrs[i + filter[i].jf];

if (image) {
bpf_flush_icache(image, image + proglen);
- fp->bpf_func = (void *)image;
+ bpf_func = (void *)image;
}
out:
kfree(addrs);
- return;
+ return bpf_func;
}

static void jit_free_defer(struct work_struct *arg)
@@ -814,10 +814,10 @@ static void jit_free_defer(struct work_struct *arg)
/* run from softirq, we must use a work_struct to call
* module_free() from process context
*/
-void bpf_jit_free(struct sk_filter *fp)
+void bpf_jit_free(bpf_func_t bpf_func)
{
- if (fp->bpf_func != sk_run_filter) {
- struct work_struct *work = (struct work_struct *)fp->bpf_func;
+ if (bpf_func != sk_run_filter) {
+ struct work_struct *work = (struct work_struct *)bpf_func;

INIT_WORK(work, jit_free_defer);
schedule_work(work);
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index f66b540..8898680 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -144,7 +144,7 @@ static int pkt_type_offset(void)
return -1;
}

-void bpf_jit_compile(struct sk_filter *fp)
+bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen)
{
u8 temp[64];
u8 *prog;
@@ -157,15 +157,14 @@ void bpf_jit_compile(struct sk_filter *fp)
int pc_ret0 = -1; /* bpf index of first RET #0 instruction (if any) */
unsigned int cleanup_addr; /* epilogue code offset */
unsigned int *addrs;
- const struct sock_filter *filter = fp->insns;
- int flen = fp->len;
+ bpf_func_t bpf_func = sk_run_filter;

if (!bpf_jit_enable)
- return;
+ return bpf_func;

addrs = kmalloc(flen * sizeof(*addrs), GFP_KERNEL);
if (addrs == NULL)
- return;
+ return bpf_func;

/* Before first pass, make a rough estimation of addrs[]
* each bpf instruction is translated to less than 64 bytes
@@ -694,7 +693,7 @@ cond_branch: f_offset = addrs[i + filter[i].jf] - addrs[i];
pr_err("bpb_jit_compile fatal error\n");
kfree(addrs);
module_free(NULL, image);
- return;
+ return bpf_func;
}
memcpy(image + proglen, temp, ilen);
}
@@ -731,11 +730,11 @@ cond_branch: f_offset = addrs[i + filter[i].jf] - addrs[i];

if (image) {
bpf_flush_icache(image, image + proglen);
- fp->bpf_func = (void *)image;
+ bpf_func = (void *)image;
}
out:
kfree(addrs);
- return;
+ return bpf_func;
}

static void jit_free_defer(struct work_struct *arg)
@@ -746,10 +745,10 @@ static void jit_free_defer(struct work_struct *arg)
/* run from softirq, we must use a work_struct to call
* module_free() from process context
*/
-void bpf_jit_free(struct sk_filter *fp)
+void bpf_jit_free(bpf_func_t bpf_func)
{
- if (fp->bpf_func != sk_run_filter) {
- struct work_struct *work = (struct work_struct *)fp->bpf_func;
+ if (bpf_func != sk_run_filter) {
+ struct work_struct *work = (struct work_struct *)bpf_func;

INIT_WORK(work, jit_free_defer);
schedule_work(work);
diff --git a/include/linux/filter.h b/include/linux/filter.h
index d1248f4..8743093 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -21,12 +21,14 @@ struct compat_sock_fprog {
struct sk_buff;
struct sock;

+typedef unsigned int (*bpf_func_t)(const struct sk_buff *skb,
+ const struct sock_filter *filter);
+
struct sk_filter
{
atomic_t refcnt;
unsigned int len; /* Number of filter blocks */
- unsigned int (*bpf_func)(const struct sk_buff *skb,
- const struct sock_filter *filter);
+ bpf_func_t bpf_func;
struct rcu_head rcu;
struct sock_filter insns[0];
};
@@ -48,11 +50,12 @@ extern int sk_chk_filter(struct sock_filter *filter, unsigned int flen);
extern int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, unsigned len);

#ifdef CONFIG_BPF_JIT
+#include <stdarg.h>
#include <linux/linkage.h>
#include <linux/printk.h>

-extern void bpf_jit_compile(struct sk_filter *fp);
-extern void bpf_jit_free(struct sk_filter *fp);
+extern bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen);
+extern void bpf_jit_free(bpf_func_t bpf_func);

static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
u32 pass, void *image)
@@ -65,10 +68,11 @@ static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
}
#define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
#else
-static inline void bpf_jit_compile(struct sk_filter *fp)
+static inline bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen)
{
+ return sk_run_filter;
}
-static inline void bpf_jit_free(struct sk_filter *fp)
+static inline void bpf_jit_free(bpf_func_t bpf_func)
{
}
#define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 5af44b5..f784feb 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -55,6 +55,7 @@ struct seccomp_filter {
atomic_t usage;
struct seccomp_filter *prev;
unsigned short len; /* Instruction count */
+ bpf_func_t bpf_func;
struct sock_filter insns[];
};

@@ -211,7 +212,7 @@ static u32 seccomp_run_filters(int syscall)
* value always takes priority (ignoring the DATA).
*/
for (f = current->seccomp.filter; f; f = f->prev) {
- u32 cur_ret = sk_run_filter(NULL, f->insns);
+ u32 cur_ret = SK_RUN_FILTER(f, NULL);
if ((cur_ret & SECCOMP_RET_ACTION) < (ret & SECCOMP_RET_ACTION))
ret = cur_ret;
}
@@ -273,6 +274,8 @@ static long seccomp_attach_filter(struct sock_fprog *fprog)
if (ret)
goto fail;

+ filter->bpf_func = bpf_jit_compile(filter->insns, filter->len);
+
/*
* If there is an existing filter, make it the prev and don't drop its
* task reference.
@@ -330,6 +333,7 @@ void put_seccomp_filter(struct task_struct *tsk)
while (orig && atomic_dec_and_test(&orig->usage)) {
struct seccomp_filter *freeme = orig;
orig = orig->prev;
+ bpf_jit_free(freeme->bpf_func);
kfree(freeme);
}
}
diff --git a/net/core/filter.c b/net/core/filter.c
index dad2a17..0a7900b 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -643,7 +643,7 @@ void sk_filter_release_rcu(struct rcu_head *rcu)
{
struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);

- bpf_jit_free(fp);
+ bpf_jit_free(fp->bpf_func);
kfree(fp);
}
EXPORT_SYMBOL(sk_filter_release_rcu);
@@ -652,13 +652,11 @@ static int __sk_prepare_filter(struct sk_filter *fp)
{
int err;

- fp->bpf_func = sk_run_filter;
-
err = sk_chk_filter(fp->insns, fp->len);
if (err)
return err;

- bpf_jit_compile(fp);
+ fp->bpf_func = bpf_jit_compile(fp->insns, fp->len);
return 0;
}

--
1.8.1.2

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