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better header_size check

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Originally committed as revision 16830 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-01-27 21:01:47 +00:00
parent 4698bb2457
commit 59afda9f61
1 changed files with 1 additions and 1 deletions
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libavformat/4xm.c
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@ -114,7 +114,7 @@ static int fourxm_read_header(AVFormatContext *s,
/* check for LIST-HEAD */
GET_LIST_HEADER();
header_size = size - 4;
if (fourcc_tag != HEAD_TAG || size < 4)
if (fourcc_tag != HEAD_TAG || header_size < 0)
return AVERROR_INVALIDDATA;
/* allocate space for the header and load the whole thing */