mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

libbpf: fix an snprintf() overflow check 

[ Upstream commit b77ffb30cf ]

The snprintf() function returns the number of bytes it *would* have
copied if there were enough space.  So it can return > the
sizeof(gen->attach_target).

Fixes: 6723474373 ("libbpf: Generate loader program out of BPF ELF file.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/YtZ+oAySqIhFl6/J@kili
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2022-07-19 12:51:28 +03:00 committed by Greg Kroah-Hartman
parent 19c21280fb
commit e9458504b7
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/lib/bpf/gen_loader.c
View File

@ -533,7 +533,7 @@ void bpf_gen__record_attach_target(struct bpf_gen *gen, const char *attach_name,
gen->attach_kind = kind;
ret = snprintf(gen->attach_target, sizeof(gen->attach_target), "%s%s",
prefix, attach_name);
if (ret == sizeof(gen->attach_target))
if (ret >= sizeof(gen->attach_target))
gen->error = -ENOSPC;
}