diff options
| author | Menglong Dong <imagedong@tencent.com> | 2023-07-19 19:03:30 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-07-19 09:55:22 -0700 |
| commit | 492e797fdab25f2d8eb1b6bb3236f4aac474f878 (patch) | |
| tree | 001dccfccc121c8309d4da6ff7f9fdfefae595bf /arch | |
| parent | 9df76fe0c5ac7622dfd16c47f98f3d48e890890e (diff) | |
bpf, x86: initialize the variable "first_off" in save_args()
As Dan Carpenter reported, the variable "first_off" which is passed to
clean_stack_garbage() in save_args() can be uninitialized, which can
cause runtime warnings with KMEMsan. Therefore, init it with 0.
Fixes: 473e3150e30a ("bpf, x86: allow function arguments up to 12 for TRACING")
Cc: Hao Peng <flyingpeng@tencent.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/bpf/09784025-a812-493f-9829-5e26c8691e07@moroto.mountain/
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Link: https://lore.kernel.org/r/20230719110330.2007949-1-imagedong@tencent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/net/bpf_jit_comp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index 5ab531be56ac..83c4b45dc65f 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1925,7 +1925,7 @@ static int get_nr_used_regs(const struct btf_func_model *m) static void save_args(const struct btf_func_model *m, u8 **prog, int stack_size, bool for_call_origin) { - int arg_regs, first_off, nr_regs = 0, nr_stack_slots = 0; + int arg_regs, first_off = 0, nr_regs = 0, nr_stack_slots = 0; int i, j; /* Store function arguments to stack. |