[PATCH v3 2/4] mtd: always initialize 'stats' in struct mtd_oob_ops
From: Michał Kępień
Date: Tue Jan 25 2022 - 05:52:02 EST
As the 'stats' field in struct mtd_oob_ops is used in conditional
expressions, ensure it is always zero-initialized in all such structures
to prevent random stack garbage from being interpreted as a pointer.
Strictly speaking, this problem currently only needs to be fixed for
struct mtd_oob_ops structures subsequently passed to mtd_read_oob().
However, this commit goes a step further and makes all instances of
struct mtd_oob_ops in the tree zero-initialized, in hope of preventing
future problems, e.g. if struct mtd_req_stats gets extended with write
statistics at some point.
Signed-off-by: Michał Kępień <kernel@xxxxxxxxxx>
---
Obviously this objective can be achieved in various ways. I was aiming
for a minimal diff which does the job.
drivers/mtd/inftlcore.c | 6 +++---
drivers/mtd/mtdswap.c | 6 +++---
drivers/mtd/nand/onenand/onenand_base.c | 4 ++--
drivers/mtd/nand/onenand/onenand_bbt.c | 2 +-
drivers/mtd/nand/raw/nand_bbt.c | 8 ++++----
drivers/mtd/nand/raw/sm_common.c | 2 +-
drivers/mtd/nftlcore.c | 6 +++---
drivers/mtd/sm_ftl.c | 4 ++--
drivers/mtd/ssfdc.c | 2 +-
drivers/mtd/tests/nandbiterrs.c | 2 +-
drivers/mtd/tests/oobtest.c | 8 ++++----
drivers/mtd/tests/readtest.c | 2 +-
fs/jffs2/wbuf.c | 6 +++---
13 files changed, 29 insertions(+), 29 deletions(-)
diff --git a/drivers/mtd/inftlcore.c b/drivers/mtd/inftlcore.c
index 6b48397c750c..58ca1c21ebe6 100644
--- a/drivers/mtd/inftlcore.c
+++ b/drivers/mtd/inftlcore.c
@@ -136,7 +136,7 @@ static void inftl_remove_dev(struct mtd_blktrans_dev *dev)
int inftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -156,7 +156,7 @@ int inftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
int inftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -176,7 +176,7 @@ int inftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
static int inftl_write(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf, uint8_t *oob)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
index e86b04bc1d6b..ce3796b929e7 100644
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -323,7 +323,7 @@ static int mtdswap_read_markers(struct mtdswap_dev *d, struct swap_eb *eb)
struct mtdswap_oobdata *data, *data2;
int ret;
loff_t offset;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
offset = mtdswap_eb_offset(d, eb);
@@ -370,7 +370,7 @@ static int mtdswap_write_marker(struct mtdswap_dev *d, struct swap_eb *eb,
struct mtdswap_oobdata n;
int ret;
loff_t offset;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.ooboffs = 0;
ops.oobbuf = (uint8_t *)&n;
@@ -878,7 +878,7 @@ static unsigned int mtdswap_eblk_passes(struct mtdswap_dev *d,
loff_t base, pos;
unsigned int *p1 = (unsigned int *)d->page_buf;
unsigned char *p2 = (unsigned char *)d->oob_buf;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret;
ops.mode = MTD_OPS_AUTO_OOB;
diff --git a/drivers/mtd/nand/onenand/onenand_base.c b/drivers/mtd/nand/onenand/onenand_base.c
index 958bac54b190..5810104420a2 100644
--- a/drivers/mtd/nand/onenand/onenand_base.c
+++ b/drivers/mtd/nand/onenand/onenand_base.c
@@ -2935,7 +2935,7 @@ static int do_otp_write(struct mtd_info *mtd, loff_t to, size_t len,
struct onenand_chip *this = mtd->priv;
unsigned char *pbuf = buf;
int ret;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
/* Force buffer page aligned */
if (len < mtd->writesize) {
@@ -2977,7 +2977,7 @@ static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct onenand_chip *this = mtd->priv;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret;
if (FLEXONENAND(this)) {
diff --git a/drivers/mtd/nand/onenand/onenand_bbt.c b/drivers/mtd/nand/onenand/onenand_bbt.c
index b17315f8e1d4..d7fe35bc45cb 100644
--- a/drivers/mtd/nand/onenand/onenand_bbt.c
+++ b/drivers/mtd/nand/onenand/onenand_bbt.c
@@ -61,7 +61,7 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
int startblock;
loff_t from;
size_t readlen;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int rgn;
printk(KERN_INFO "Scanning device for bad blocks\n");
diff --git a/drivers/mtd/nand/raw/nand_bbt.c b/drivers/mtd/nand/raw/nand_bbt.c
index ab630af3a309..817fff3584e3 100644
--- a/drivers/mtd/nand/raw/nand_bbt.c
+++ b/drivers/mtd/nand/raw/nand_bbt.c
@@ -313,7 +313,7 @@ static int scan_read_oob(struct nand_chip *this, uint8_t *buf, loff_t offs,
size_t len)
{
struct mtd_info *mtd = nand_to_mtd(this);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res, ret = 0;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -354,7 +354,7 @@ static int scan_write_bbt(struct nand_chip *this, loff_t offs, size_t len,
uint8_t *buf, uint8_t *oob)
{
struct mtd_info *mtd = nand_to_mtd(this);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.mode = MTD_OPS_PLACE_OOB;
ops.ooboffs = 0;
@@ -416,7 +416,7 @@ static int scan_block_fast(struct nand_chip *this, struct nand_bbt_descr *bd,
{
struct mtd_info *mtd = nand_to_mtd(this);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret, page_offset;
ops.ooblen = mtd->oobsize;
@@ -756,7 +756,7 @@ static int write_bbt(struct nand_chip *this, uint8_t *buf,
uint8_t rcode = td->reserved_block_code;
size_t retlen, len = 0;
loff_t to;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.ooblen = mtd->oobsize;
ops.ooboffs = 0;
diff --git a/drivers/mtd/nand/raw/sm_common.c b/drivers/mtd/nand/raw/sm_common.c
index ba24cb36d0b9..6df33e8d77df 100644
--- a/drivers/mtd/nand/raw/sm_common.c
+++ b/drivers/mtd/nand/raw/sm_common.c
@@ -99,7 +99,7 @@ static const struct mtd_ooblayout_ops oob_sm_small_ops = {
static int sm_block_markbad(struct nand_chip *chip, loff_t ofs)
{
struct mtd_info *mtd = nand_to_mtd(chip);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
struct sm_oob oob;
int ret;
diff --git a/drivers/mtd/nftlcore.c b/drivers/mtd/nftlcore.c
index 913db0dd6a8d..64d319e959b2 100644
--- a/drivers/mtd/nftlcore.c
+++ b/drivers/mtd/nftlcore.c
@@ -124,7 +124,7 @@ int nftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf)
{
loff_t mask = mtd->writesize - 1;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -145,7 +145,7 @@ int nftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf)
{
loff_t mask = mtd->writesize - 1;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
@@ -168,7 +168,7 @@ static int nftl_write(struct mtd_info *mtd, loff_t offs, size_t len,
size_t *retlen, uint8_t *buf, uint8_t *oob)
{
loff_t mask = mtd->writesize - 1;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int res;
ops.mode = MTD_OPS_PLACE_OOB;
diff --git a/drivers/mtd/sm_ftl.c b/drivers/mtd/sm_ftl.c
index 0cff2cda1b5a..cb182333d635 100644
--- a/drivers/mtd/sm_ftl.c
+++ b/drivers/mtd/sm_ftl.c
@@ -239,7 +239,7 @@ static int sm_read_sector(struct sm_ftl *ftl,
uint8_t *buffer, struct sm_oob *oob)
{
struct mtd_info *mtd = ftl->trans->mtd;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
struct sm_oob tmp_oob;
int ret = -EIO;
int try = 0;
@@ -323,7 +323,7 @@ static int sm_write_sector(struct sm_ftl *ftl,
int zone, int block, int boffset,
uint8_t *buffer, struct sm_oob *oob)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
struct mtd_info *mtd = ftl->trans->mtd;
int ret;
diff --git a/drivers/mtd/ssfdc.c b/drivers/mtd/ssfdc.c
index 1d05c121904c..04da685c36be 100644
--- a/drivers/mtd/ssfdc.c
+++ b/drivers/mtd/ssfdc.c
@@ -163,7 +163,7 @@ static int read_physical_sector(struct mtd_info *mtd, uint8_t *sect_buf,
/* Read redundancy area (wrapper to MTD_READ_OOB */
static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret;
ops.mode = MTD_OPS_RAW;
diff --git a/drivers/mtd/tests/nandbiterrs.c b/drivers/mtd/tests/nandbiterrs.c
index 08084c018a59..98d7508f95b1 100644
--- a/drivers/mtd/tests/nandbiterrs.c
+++ b/drivers/mtd/tests/nandbiterrs.c
@@ -99,7 +99,7 @@ static int write_page(int log)
static int rewrite_page(int log)
{
int err = 0;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
if (log)
pr_info("rewrite page\n");
diff --git a/drivers/mtd/tests/oobtest.c b/drivers/mtd/tests/oobtest.c
index 532997e10e29..13fed398937e 100644
--- a/drivers/mtd/tests/oobtest.c
+++ b/drivers/mtd/tests/oobtest.c
@@ -56,7 +56,7 @@ static void do_vary_offset(void)
static int write_eraseblock(int ebnum)
{
int i;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
@@ -165,7 +165,7 @@ static size_t memffshow(loff_t addr, loff_t offset, const void *cs,
static int verify_eraseblock(int ebnum)
{
int i;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
size_t bitflips;
@@ -260,7 +260,7 @@ static int verify_eraseblock(int ebnum)
static int verify_eraseblock_in_one_go(int ebnum)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
size_t len = mtd->oobavail * pgcnt;
@@ -338,7 +338,7 @@ static int __init mtd_oobtest_init(void)
int err = 0;
unsigned int i;
uint64_t tmp;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
loff_t addr = 0, addr0;
printk(KERN_INFO "\n");
diff --git a/drivers/mtd/tests/readtest.c b/drivers/mtd/tests/readtest.c
index e70d588083a3..99670ef91f2b 100644
--- a/drivers/mtd/tests/readtest.c
+++ b/drivers/mtd/tests/readtest.c
@@ -47,7 +47,7 @@ static int read_eraseblock_by_page(int ebnum)
err = ret;
}
if (mtd->oobsize) {
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.mode = MTD_OPS_PLACE_OOB;
ops.len = 0;
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index c6821a509481..4061e0ba7010 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -1035,7 +1035,7 @@ int jffs2_check_oob_empty(struct jffs2_sb_info *c,
{
int i, ret;
int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
ops.mode = MTD_OPS_AUTO_OOB;
ops.ooblen = NR_OOB_SCAN_PAGES * c->oobavail;
@@ -1076,7 +1076,7 @@ int jffs2_check_oob_empty(struct jffs2_sb_info *c,
int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb)
{
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int ret, cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
ops.mode = MTD_OPS_AUTO_OOB;
@@ -1101,7 +1101,7 @@ int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb)
{
int ret;
- struct mtd_oob_ops ops;
+ struct mtd_oob_ops ops = { };
int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
ops.mode = MTD_OPS_AUTO_OOB;
--
2.34.1