[FFmpeg-cvslog] avformat/bit: check that pkt->size is 10 in write_packet

[Andreas Cadhalpun]

ffmpeg | branch: release/0.10 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Thu Feb 26 21:38:50 2015 +0100| [6739df26a62049ae579fa2a31c2552315eb640da] | committer: Michael Niedermayer

avformat/bit: check that pkt->size is 10 in write_packet

Ohter packet sizes are not supported by this muxer.

This avoids a null pointer dereference of pkt->data.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit eeda2c3de8a8484d9e7d1e47ac836bec850b31fc)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6739df26a62049ae579fa2a31c2552315eb640da
---

 libavformat/bit.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/bit.c b/libavformat/bit.c
index 1249ea1..f346cf4 100644
--- a/libavformat/bit.c
+++ b/libavformat/bit.c
@@ -132,6 +132,9 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
     GetBitContext gb;
     int i;
 
+    if (pkt->size != 10)
+        return AVERROR(EINVAL);
+
     avio_wl16(pb, SYNC_WORD);
     avio_wl16(pb, 8 * 10);