[PATCH 4.9 035/141] perf strbuf: Match va_{add,copy} with va_end

Greg Kroah-Hartman
2018-11-11T22:46:19Z

From: Sanskriti Sharma <sansharm@redhat.com>

[ Upstream commit ce49d8436cffa9b7a6a5f110879d53e89dbc6746 ]

Ensure that all code paths in strbuf_addv() call va_end() on the
ap_saved copy that was made.

Fixes the following coverity complaint:

Error: VARARGS (CWE-237): [#def683]
tools/perf/util/strbuf.c:106: missing_va_end: va_end was not called
for "ap_saved".

Signed-off-by: Sanskriti Sharma <sansharm@redhat.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Joe Lawrence <joe.lawrence@redhat.com>
Link: http://lkml.kernel.org/r/1538490554-8161-2-git-send-email-sansharm@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
tools/perf/util/strbuf.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

--- a/tools/perf/util/strbuf.c
+++ b/tools/perf/util/strbuf.c
@@ -105,19 +105,25 @@ static int strbuf_addv(struct strbuf *sb

va_copy(ap_saved, ap);
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
- if (len < 0)
+ if (len < 0) {
+ va_end(ap_saved);
return len;
+ }
if (len > strbuf_avail(sb)) {
ret = strbuf_grow(sb, len);
- if (ret)
+ if (ret) {
+ va_end(ap_saved);
return ret;
+ }
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved);
va_end(ap_saved);
if (len > strbuf_avail(sb)) {
pr_debug("this should not happen, your vsnprintf is broken");
+ va_end(ap_saved);
return -EINVAL;
}
}
+ va_end(ap_saved);
return strbuf_setlen(sb, sb->len + len);
}