[FFmpeg-cvslog] avcodec/movtextdec: Fix decode_styl() cleanup

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Mon Feb  6 11:17:10 2017 +0100| [6c1a2e6bc3f0a23b629827f141a644fc646c667e] | committer: Michael Niedermayer

avcodec/movtextdec: Fix decode_styl() cleanup

Fixes: null pointer dereference
Fixes: 555/clusterfuzz-testcase-5986646595993600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit e248522d1b0d6dd8641f382cd5c4338d0ecd98e5)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6c1a2e6bc3f0a23b629827f141a644fc646c667e
---

 libavcodec/movtextdec.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libavcodec/movtextdec.c b/libavcodec/movtextdec.c
index 7b5b161..81fd1d6 100644
--- a/libavcodec/movtextdec.c
+++ b/libavcodec/movtextdec.c
@@ -116,6 +116,8 @@ static void mov_text_cleanup(MovTextContext *m)
             av_freep(&m->s[i]);
         }
         av_freep(&m->s);
+        m->count_s = 0;
+        m->style_entries = 0;
     }
 }
 
@@ -279,12 +281,14 @@ static int decode_hclr(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
 static int decode_styl(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
 {
     int i;
-    m->style_entries = AV_RB16(tsmb);
+    int style_entries = AV_RB16(tsmb);
     tsmb += 2;
     // A single style record is of length 12 bytes.
-    if (m->tracksize + m->size_var + 2 + m->style_entries * 12 > avpkt->size)
+    if (m->tracksize + m->size_var + 2 + style_entries * 12 > avpkt->size)
         return -1;
 
+    m->style_entries = style_entries;
+
     m->box_flags |= STYL_BOX;
     for(i = 0; i < m->style_entries; i++) {
         m->s_temp = av_malloc(sizeof(*m->s_temp));