[FFmpeg-cvslog] mjpegdec: check SE.

[Michael Niedermayer]

ffmpeg | branch: release/1.0 | Michael Niedermayer <michaelni at gmx.at> | Sun Nov 11 00:01:24 2012 +0100| [12fb647994c89cd6c45da9497ff7589d760c6ec1] | committer: Michael Niedermayer

mjpegdec: check SE.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=12fb647994c89cd6c45da9497ff7589d760c6ec1
---

 libavcodec/mjpegdec.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index d829b1b..0fca372 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -1097,6 +1097,11 @@ static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
     int last_scan = 0;
     int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
 
+    if (se > 63) {
+        av_log(s->avctx, AV_LOG_ERROR, "SE %d is too large\n", se);
+        return AVERROR_INVALIDDATA;
+    }
+
     if (!Al) {
         s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
         last_scan = !~s->coefs_finished[c];