[FFmpeg-cvslog] smackerdemuxer: check some values before instead of just after malloc()
Michael Niedermayer
git at videolan.org
Thu Mar 12 00:52:52 CET 2015
ffmpeg | branch: release/0.7 | Michael Niedermayer <michaelni at gmx.at> | Fri Dec 16 02:57:22 2011 +0100| [127a2902533cfb6d55cf1960d5f184eb4f02211f] | committer: Michael Niedermayer
smackerdemuxer: check some values before instead of just after malloc()
Fixes Ticket777
Bug Found by: Diana Elena Muscalu
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit c402c1c976dc5bd63908d1aaff5b60521cbbee92)
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=127a2902533cfb6d55cf1960d5f184eb4f02211f
---
libavformat/smacker.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/libavformat/smacker.c b/libavformat/smacker.c
index b2c442e..faf85a5 100644
--- a/libavformat/smacker.c
+++ b/libavformat/smacker.c
@@ -251,6 +251,8 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
memcpy(oldpal, pal, 768);
size = avio_r8(s->pb);
size = size * 4 - 1;
+ if(size + 1 > frame_size)
+ return AVERROR_INVALIDDATA;
frame_size -= size;
frame_size--;
sz = 0;
@@ -292,10 +294,12 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
/* if audio chunks are present, put them to stack and retrieve later */
for(i = 0; i < 7; i++) {
if(flags & 1) {
- int size;
+ unsigned int size;
uint8_t *tmpbuf;
size = avio_rl32(s->pb) - 4;
+ if(size + 4L > frame_size)
+ return AVERROR_INVALIDDATA;
frame_size -= size;
frame_size -= 4;
smk->curstream++;
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