diff options
| author | Yafang Shao <laoar.shao@gmail.com> | 2023-08-13 17:18:59 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-08-16 17:44:23 +0300 |
| commit | 0aa35162d2a1ed7ae5303b8d91f7290d3b8b9219 (patch) | |
| tree | 6f024ce8ddafb7a080a191ebc7dd479aa90b2baa /kernel/bpf | |
| parent | 8897562f67b3e61ad736cd5c9f307447d33280e4 (diff) | |
| download | linux-0aa35162d2a1ed7ae5303b8d91f7290d3b8b9219.tar.xz | |
bpf: Fix uninitialized symbol in bpf_perf_link_fill_kprobe()
The commit 1b715e1b0ec5 ("bpf: Support ->fill_link_info for perf_event") leads
to the following Smatch static checker warning:
kernel/bpf/syscall.c:3416 bpf_perf_link_fill_kprobe()
error: uninitialized symbol 'type'.
That can happens when uname is NULL. So fix it by verifying the uname when we
really need to fill it.
Fixes: 1b715e1b0ec5 ("bpf: Support ->fill_link_info for perf_event")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Closes: https://lore.kernel.org/bpf/85697a7e-f897-4f74-8b43-82721bebc462@kili.mountain
Link: https://lore.kernel.org/bpf/20230813141900.1268-2-laoar.shao@gmail.com
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/syscall.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 7f4e8c357a6a..cb658543bdb4 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -3378,14 +3378,13 @@ static int bpf_perf_link_fill_common(const struct perf_event *event, if (!ulen ^ !uname) return -EINVAL; - if (!uname) - return 0; err = bpf_get_perf_event_info(event, &prog_id, fd_type, &buf, probe_offset, probe_addr); if (err) return err; - + if (!uname) + return 0; if (buf) { len = strlen(buf); err = bpf_copy_to_user(uname, buf, ulen, len); |