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Make sure we dont read over the end.

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Fixes issue1237.

Originally committed as revision 19322 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-07-01 20:30:37 +00:00
parent edb501c45b
commit 37458d7e1b
1 changed files with 13 additions and 0 deletions
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13
libavcodec/huffyuv.c
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@ -729,10 +729,17 @@ static void decode_422_bitstream(HYuvContext *s, int count){
count/=2;
if(count >= (s->gb.size_in_bits - get_bits_count(&s->gb))/(31*4)){
for(i=0; i<count && get_bits_count(&s->gb) < s->gb.size_in_bits; i++){
READ_2PIX(s->temp[0][2*i ], s->temp[1][i], 1);
READ_2PIX(s->temp[0][2*i+1], s->temp[2][i], 2);
}
}else{
for(i=0; i<count; i++){
READ_2PIX(s->temp[0][2*i ], s->temp[1][i], 1);
READ_2PIX(s->temp[0][2*i+1], s->temp[2][i], 2);
}
}
}
static void decode_gray_bitstream(HYuvContext *s, int count){
@ -740,9 +747,15 @@ static void decode_gray_bitstream(HYuvContext *s, int count){
count/=2;
if(count >= (s->gb.size_in_bits - get_bits_count(&s->gb))/(31*2)){
for(i=0; i<count && get_bits_count(&s->gb) < s->gb.size_in_bits; i++){
READ_2PIX(s->temp[0][2*i ], s->temp[0][2*i+1], 0);
}
}else{
for(i=0; i<count; i++){
READ_2PIX(s->temp[0][2*i ], s->temp[0][2*i+1], 0);
}
}
}
#if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER