better header_size check

Originally committed as revision 16830 to svn://svn.ffmpeg.org/ffmpeg/trunk
16 years ago · 59afda9f61
parent 4698bb2457
commit 59afda9f61
1 changed files with 1 additions and 1 deletions
--- a/libavformat/4xm.c
+++ b/libavformat/4xm.c
@ -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 */