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| author | Chang-Hsien Tsai <luke.tw@gmail.com> | 2019-05-19 09:05:44 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-21 09:04:17 +0200 |
| commit | 1772f38b97a22616a503a7d61c921fd72ba1200b (patch) | |
| tree | 865148e48f8c719fd2f91af54c92a5093871cc05 /samples | |
| parent | c83caff2c12f18e68e51635eb31fd4e5146ebf55 (diff) | |
| download | linux-stable-1772f38b97a22616a503a7d61c921fd72ba1200b.tar.gz linux-stable-1772f38b97a22616a503a7d61c921fd72ba1200b.tar.bz2 linux-stable-1772f38b97a22616a503a7d61c921fd72ba1200b.zip | |
samples, bpf: fix to change the buffer size for read()
[ Upstream commit f7c2d64bac1be2ff32f8e4f500c6e5429c1003e0 ]
If the trace for read is larger than 4096, the return
value sz will be 4096. This results in off-by-one error
on buf:
static char buf[4096];
ssize_t sz;
sz = read(trace_fd, buf, sizeof(buf));
if (sz > 0) {
buf[sz] = 0;
puts(buf);
}
Signed-off-by: Chang-Hsien Tsai <luke.tw@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/bpf_load.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c index 2325d7ad76df..e8e8b756dc52 100644 --- a/samples/bpf/bpf_load.c +++ b/samples/bpf/bpf_load.c @@ -613,7 +613,7 @@ void read_trace_pipe(void) static char buf[4096]; ssize_t sz; - sz = read(trace_fd, buf, sizeof(buf)); + sz = read(trace_fd, buf, sizeof(buf) - 1); if (sz > 0) { buf[sz] = 0; puts(buf); |