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faxcompr: Dont read ref when the end has been reached in pass mode 

Fixes reading over the end

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-02-12 22:14:50 +01:00
parent 1ac0fa50ef
commit 6f9ae391de
1 changed files with 4 additions and 2 deletions
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6
libavcodec/faxcompr.c
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@ -170,10 +170,12 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
return -1;
}
if(!cmode){//pass mode
run_off += *ref++;
if(run_off < width)
run_off += *ref++;
run = run_off - offs;
offs= run_off;
run_off += *ref++;
if(run_off < width)
run_off += *ref++;
if(offs > width){
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return -1;