ffmpeg: Fix cleanup after failed allocation of output_files

Fixes: 39a25908b84604acdaa490138282d091_signal_sigsegv_7ffff713351a_331_WAWV.avi with memlimit of 262144

Found-by: Samuel Groß, Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 6e80fe1ecd984a59bb6c73cbb436cc06536b7728)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 4 insertions, 1 deletions

diff --git a/ffmpeg.c b/ffmpeg.c
index c4e3099780..2c757bd5a4 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -455,7 +455,10 @@ static void ffmpeg_cleanup(int ret)
     /* close files */
     for (i = 0; i < nb_output_files; i++) {
         OutputFile *of = output_files[i];
-        AVFormatContext *s = of->ctx;
+        AVFormatContext *s;
+        if (!of)
+            continue;
+        s = of->ctx;
         if (s && s->oformat && !(s->oformat->flags & AVFMT_NOFILE))
             avio_closep(&s->pb);
         avformat_free_context(s);