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samples: bpf: fix: seg fault with NULL pointer arg

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[ Upstream commit d59dd69d5576d699d7d3f5da0b4738c3a36d0133 ]

When NULL pointer accidentally passed to write_kprobe_events,
due to strlen(NULL), segmentation fault happens.
Changed code returns -1 to deal with this situation.

Bug issued with Smatch, static analysis.

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniel T. Lee 2018-12-03 19:39:30 +09:00 committed by Greg Kroah-Hartman
parent c41f30e8d2
commit 335d4f8182
1 changed files with 3 additions and 1 deletions
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4
samples/bpf/bpf_load.c
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@ -59,7 +59,9 @@ static int write_kprobe_events(const char *val)
{
int fd, ret, flags;
if ((val != NULL) && (val[0] == '\0'))
if (val == NULL)
return -1;
else if (val[0] == '\0')
flags = O_WRONLY | O_TRUNC;
else
flags = O_WRONLY | O_APPEND;