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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: 473e3150e3 ("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>
This commit is contained in:
Menglong Dong 2023-07-19 19:03:30 +08:00 committed by Alexei Starovoitov
parent 9df76fe0c5
commit 492e797fda
1 changed files with 1 additions and 1 deletions
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arch/x86/net/bpf_jit_comp.c
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@ -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.