From: John Koleszar <jkoleszar@google.com>
Date: Fri, 7 Jun 2013 15:49:38 +0000 (-0700)
Subject: Fix a crash in vpxdec
X-Git-Tag: v1.3.0~1104^2~13
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c0e561d15e5b08fae575c539da275d31d3eb519b;p=libvpx

Fix a crash in vpxdec

If the codec fails to return a frame on the second frame (as in a VP8 alt-ref,
then img will be a null pointer and dereferencing it while trying to write
the color format (again) will crash.

Change-Id: Ie48710d4c5715f532d453c879c71c20ccdeb81cc
---

diff --git a/vpxdec.c b/vpxdec.c
index 811d41ba3..9ae868f29 100644
--- a/vpxdec.c
+++ b/vpxdec.c
@@ -1025,7 +1025,7 @@ int main(int argc, const char **argv_) {
       show_progress(frame_in, frame_out, dx_time);
 
     if (!noblit) {
-      if (frame_out == 1 && use_y4m) {
+      if (frame_out == 1 && img && use_y4m) {
         /* Write out the color format to terminate the header line */
         const char *color =
             img->fmt == VPX_IMG_FMT_444A ? "C444alpha\n" :