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buffer overflows

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one found by Milan Cutka
one by me

Originally committed as revision 3963 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-02-17 19:00:42 +00:00
parent c2d57a34d0
commit ae2f1d4624
1 changed files with 19 additions and 7 deletions
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26
libavcodec/huffyuv.c
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@ -348,9 +348,20 @@ static int read_old_huffman_tables(HYuvContext *s){
#endif
}
static void alloc_temp(HYuvContext *s){
int i;
if(s->bitstream_bpp<24){
for(i=0; i<3; i++){
s->temp[i]= av_malloc(s->width + 16);
}
}else{
s->temp[0]= av_malloc(4*s->width + 16);
}
}
static int common_init(AVCodecContext *avctx){
HYuvContext *s = avctx->priv_data;
int i;
s->avctx= avctx;
s->flags= avctx->flags;
@ -360,10 +371,7 @@ static int common_init(AVCodecContext *avctx){
s->width= avctx->width;
s->height= avctx->height;
assert(s->width>0 && s->height>0);
for(i=0; i<3; i++){
s->temp[i]= av_malloc(avctx->width + 16);
}
return 0;
}
@ -456,6 +464,8 @@ s->bgr32=1;
assert(0);
}
alloc_temp(s);
// av_log(NULL, AV_LOG_DEBUG, "pred:%d bpp:%d hbpp:%d il:%d\n", s->predictor, s->bitstream_bpp, avctx->bits_per_sample, s->interlaced);
return 0;
@ -599,6 +609,8 @@ static int encode_init(AVCodecContext *avctx)
// printf("pred:%d bpp:%d hbpp:%d il:%d\n", s->predictor, s->bitstream_bpp, avctx->bits_per_sample, s->interlaced);
alloc_temp(s);
s->picture_number=0;
return 0;
@ -1148,11 +1160,11 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
if(s->predictor == PLANE && s->interlaced < cy){
s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);
s->dsp.diff_bytes(s->temp[2], udst, udst - fake_ustride, width2);
s->dsp.diff_bytes(s->temp[2] + 1250, vdst, vdst - fake_vstride, width2);
s->dsp.diff_bytes(s->temp[2] + width2, vdst, vdst - fake_vstride, width2);
lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);
leftu= sub_left_prediction(s, s->temp[1], s->temp[2], width2, leftu);
leftv= sub_left_prediction(s, s->temp[2], s->temp[2] + 1250, width2, leftv);
leftv= sub_left_prediction(s, s->temp[2], s->temp[2] + width2, width2, leftv);
}else{
lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);
leftu= sub_left_prediction(s, s->temp[1], udst, width2, leftu);