---
libavformat/isom.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/libavformat/isom.c b/libavformat/isom.c
index 48fd8e1..dffff3d 100644
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@@ -418,7 +418,7 @@ int ff_mp4_read_dec_config_descr(AVFormatContext *fc,
AVStream *st, AVIOContext
len = ff_mp4_read_descr(fc, pb, &tag);
if (tag == MP4DecSpecificDescrTag) {
av_dlog(fc, "Specific MPEG4 header len=%d\n", len);
- if((uint64_t)len > (1<<30))
+ if (len || (uint64_t)len > (1<<30))
return -1;
av_free(st->codec->extradata);
st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
--
1.7.3.1
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