[FFmpeg-devel] [PATCH 3/6] avformat/asfdec_o: Check size_bmp more fully

Michael Niedermayer michael at niedermayer.cc
Wed Jul 4 00:05:27 EEST 2018


Fixes: integer overflow and out of array access
Fixes: asfo-crash-46080c4341572a7137a162331af77f6ded45cbd7

Found-by: Paul Ch <paulcher at icloud.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/asfdec_o.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/asfdec_o.c b/libavformat/asfdec_o.c
index 5122e33c78..b4b2698368 100644
--- a/libavformat/asfdec_o.c
+++ b/libavformat/asfdec_o.c
@@ -706,7 +706,8 @@ static int parse_video_info(AVIOContext *pb, AVStream *st)
     st->codecpar->codec_id  = ff_codec_get_id(ff_codec_bmp_tags, tag);
     size_bmp = FFMAX(size_asf, size_bmp);
 
-    if (size_bmp > BMP_HEADER_SIZE) {
+    if (size_bmp > BMP_HEADER_SIZE &&
+        size_bmp < INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
         int ret;
         st->codecpar->extradata_size  = size_bmp - BMP_HEADER_SIZE;
         if (!(st->codecpar->extradata = av_malloc(st->codecpar->extradata_size +
-- 
2.18.0



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