[FFmpeg-cvslog] avcodec/dvdsub_parser: Allocate input padding
Michael Niedermayer
git at videolan.org
Mon Jul 16 21:33:25 EEST 2018
ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jul 13 18:56:10 2018 +0200| [eae9ab01930169bceb439a7ef62ecb0549e4a6fb] | committer: Michael Niedermayer
avcodec/dvdsub_parser: Allocate input padding
Fixes: out of array read
Fixes: 9350/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DVDSUB_fuzzer-5746777750765568
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit cd86b5cfe278af79d6b147e122d9a72c270a9fde)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=eae9ab01930169bceb439a7ef62ecb0549e4a6fb
---
libavcodec/dvdsub_parser.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/libavcodec/dvdsub_parser.c b/libavcodec/dvdsub_parser.c
index 8e1c48bef6..698ccb6987 100644
--- a/libavcodec/dvdsub_parser.c
+++ b/libavcodec/dvdsub_parser.c
@@ -57,7 +57,11 @@ static int dvdsub_parse(AVCodecParserContext *s,
if (pc->packet_len == 0) /* HD-DVD subpicture packet */
pc->packet_len = AV_RB32(buf+2);
av_freep(&pc->packet);
- pc->packet = av_malloc(pc->packet_len);
+ if ((unsigned)pc->packet_len > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
+ av_log(avctx, AV_LOG_ERROR, "packet length %d is invalid\n", pc->packet_len);
+ return buf_size;
+ }
+ pc->packet = av_malloc(pc->packet_len + AV_INPUT_BUFFER_PADDING_SIZE);
}
if (pc->packet) {
if (pc->packet_index + buf_size <= pc->packet_len) {
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