tree ce9ea074378cd84f29a9023ce6fce07edcee7d28
parent f36d287a761cd19825ba3b581d797e30e6572909
author Chang-Hsien Tsai <luke.tw@gmail.com> 1558256744 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1563692751 +0200

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>