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samples, bpf: fix to change the buffer size for read()

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[ 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>
This commit is contained in:
Chang-Hsien Tsai 2019-05-19 09:05:44 +00:00 committed by prashantpaddune
parent 7de4ba47c7
commit 18a91ee6f9
1 changed files with 1 additions and 1 deletions
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2
samples/bpf/bpf_load.c
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@ -336,7 +336,7 @@ 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);