[FFmpeg-cvslog] h264: check for out of bounds reads in ff_h264_decode_extradata().
Laurent Aimar
git at videolan.org
Mon Sep 26 00:01:19 CEST 2011
ffmpeg | branch: master | Laurent Aimar <fenrir at videolan.org> | Sat Sep 24 16:16:39 2011 +0200| [d1186ff72d75b6067770890758c4feb92abd84f7] | committer: Anton Khirnov
h264: check for out of bounds reads in ff_h264_decode_extradata().
Signed-off-by: Anton Khirnov <anton at khirnov.net>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d1186ff72d75b6067770890758c4feb92abd84f7
---
libavcodec/h264.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 9889224..e5d0ed8 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1005,6 +1005,8 @@ int ff_h264_decode_extradata(H264Context *h)
p += 6;
for (i = 0; i < cnt; i++) {
nalsize = AV_RB16(p) + 2;
+ if (p - avctx->extradata + nalsize > avctx->extradata_size)
+ return -1;
if(decode_nal_units(h, p, nalsize) < 0) {
av_log(avctx, AV_LOG_ERROR, "Decoding sps %d from avcC failed\n", i);
return -1;
@@ -1015,6 +1017,8 @@ int ff_h264_decode_extradata(H264Context *h)
cnt = *(p++); // Number of pps
for (i = 0; i < cnt; i++) {
nalsize = AV_RB16(p) + 2;
+ if (p - avctx->extradata + nalsize > avctx->extradata_size)
+ return -1;
if (decode_nal_units(h, p, nalsize) < 0) {
av_log(avctx, AV_LOG_ERROR, "Decoding pps %d from avcC failed\n", i);
return -1;
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