From: Gu Shengxian <gushengxian@yulong.com>
Date: Tue, 6 Jul 2021 01:35:43 +0000 (-0700)
Subject: bpftool: Properly close va_list 'ap' by va_end() on error
X-Git-Tag: v4.19.199~70
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=4416df721325d97b9b8eb297e8a5d844dd3bf8b9;p=users%2Fdwmw2%2Flinux.git

bpftool: Properly close va_list 'ap' by va_end() on error

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@yulong.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/bpf/20210706013543.671114-1-gushengxian507419@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/tools/bpf/bpftool/jit_disasm.c b/tools/bpf/bpftool/jit_disasm.c
index 73d7252729fad..e4cfbecf02189 100644
--- 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 char *fmt, ...)
 {
 	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;