linux-kernel - [PATCH 4.19 050/120] bpftool: Properly close va_list ap by va

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Date:   Mon, 26 Jul 2021 17:38:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gu Shengxian <gushengxian@...ong.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH 4.19 050/120] bpftool: Properly close va_list ap by va_end() on error

From: Gu Shengxian <gushengxian@...ong.com>

commit bc832065b60f973771ff3e657214bb21b559833c upstream.

va_list 'ap' was opened but not closed by va_end() in error case. It should
be closed by va_end() before the return.

Fixes: aa52bcbe0e72 ("tools: bpftool: Fix json dump crash on powerpc")
Signed-off-by: Gu Shengxian <gushengxian@...ong.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: https://lore.kernel.org/bpf/20210706013543.671114-1-gushengxian507419@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/bpf/bpftool/jit_disasm.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/tools/bpf/bpftool/jit_disasm.c
+++ b/tools/bpf/bpftool/jit_disasm.c
@@ -51,11 +51,13 @@ static int fprintf_json(void *out, const
 {
 	va_list ap;
 	char *s;
+	int err;
 
 	va_start(ap, fmt);
-	if (vasprintf(&s, fmt, ap) < 0)
-		return -1;
+	err = vasprintf(&s, fmt, ap);
 	va_end(ap);
+	if (err < 0)
+		return -1;
 
 	if (!oper_count) {
 		int i;