bpf.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>, <ast@kernel.org>, <daniel@iogearbox.net>
Cc: <andrii@kernel.org>, <kernel-team@fb.com>
Subject: [PATCH bpf-next 2/2] libbpf: fix legacy kprobe event creation FD error handling
Date: Mon, 20 Sep 2021 11:19:59 -0700	[thread overview]
Message-ID: <20210920181959.1565954-2-andrii@kernel.org> (raw)
In-Reply-To: <20210920181959.1565954-1-andrii@kernel.org>

open() returns -1 on error, not zero FD. Fix the error handling logic.
Reported by Coverity statis analysis.

Fixes: ca304b40c20d ("libbpf: Introduce legacy kprobe events support")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
 tools/lib/bpf/libbpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 6d2f12db6034..761497be6ffc 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -9036,7 +9036,7 @@ static int poke_kprobe_events(bool add, const char *name, bool retprobe, uint64_
 	fd = open(file, O_WRONLY | O_APPEND, 0);
-	if (!fd)
+	if (fd < 0)
 		return -errno;
 	ret = write(fd, cmd, strlen(cmd));
 	if (ret < 0)

  reply	other threads:[~2021-09-20 18:22 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-20 18:19 [PATCH bpf-next 1/2] libbpf: fix memory leak in legacy kprobe attach logic Andrii Nakryiko
2021-09-20 18:19 ` Andrii Nakryiko [this message]
2021-09-20 23:23   ` [PATCH bpf-next 2/2] libbpf: fix legacy kprobe event creation FD error handling Andrii Nakryiko

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210920181959.1565954-2-andrii@kernel.org \
    --to=andrii@kernel.org \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=kernel-team@fb.com \


* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).