[PATCH bpf-next 2/4] LoongArch: BPF: Fix memory leak in bpf_jit_free

[Pu Lehui]

From: Pu Lehui <pulehui@xxxxxxxxxx>

When bpf_int_jit_compile() is called for subprograms, it returns early
during the first pass (!prog->is_func || extra_pass is false), keeping
ctx->offset alive for the subsequent extra pass.

If JIT compilation fails for a later subprogram, the BPF core aborts and
calls bpf_jit_free() to clean up the first subprogram. However,
bpf_jit_free() fails to free jit_data->ctx.offset, which causes a memory
leak of the JIT context offsets array.

Fix this by adding the missing kvfree(jit_data->ctx.offset) in
bpf_jit_free().

Fixes: 4ab17e762b34 ("LoongArch: BPF: Use BPF prog pack allocator")
Reported-by: Sashiko <sashiko-bot@xxxxxxxxxx>
Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx>
---
 arch/loongarch/net/bpf_jit.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index 2738b4db1165..3d3ed1677d01 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -2361,6 +2361,7 @@ void bpf_jit_free(struct bpf_prog *prog)
 		 */
 		if (jit_data) {
 			bpf_jit_binary_pack_finalize(jit_data->ro_header, jit_data->header);
+			kvfree(jit_data->ctx.offset);
 			kfree(jit_data);
 		}
 		hdr = bpf_jit_binary_pack_hdr(prog);
-- 
2.34.1