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Fix overflow check insufficiently improved in r19840.

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It assumes that sizeof(vmd_frame) < 64k, otherwise an additional
check to ensure sound_buffers <= UINT_MAX / sizeof(vmd_frame) would be necessary.

Originally committed as revision 19882 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-09-16 15:12:23 +00:00
parent d859bb1db0
commit 0d6da4b831
1 changed files with 1 additions and 1 deletions
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2
libavformat/sierravmd.c
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@ -161,7 +161,7 @@ static int vmd_read_header(AVFormatContext *s,
vmd->frame_table = NULL;
sound_buffers = AV_RL16(&vmd->vmd_header[808]);
raw_frame_table_size = vmd->frame_count * 6;
if(vmd->frame_count * vmd->frames_per_block >= (UINT_MAX - sound_buffers) / sizeof(vmd_frame)){
if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
return -1;
}