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authorChang-Hsien Tsai <luke.tw@gmail.com>2019-05-19 09:05:44 +0000
committerDaniel Borkmann <daniel@iogearbox.net>2019-05-21 16:36:48 +0200
commitf7c2d64bac1be2ff32f8e4f500c6e5429c1003e0 (patch)
tree9daa3a8015f051b4fc36020d310b266f652627e5 /samples/bpf
parentf7355a6c049711ecfbeed573e43d48bee7acb83a (diff)
samples, bpf: fix to change the buffer size for read()
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>
Diffstat (limited to 'samples/bpf')
-rw-r--r--samples/bpf/bpf_load.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
index eae7b635343d..6e87cc831e84 100644
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -678,7 +678,7 @@ 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);