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various security fixes and precautionary checks

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Originally committed as revision 3822 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2005-01-12 00:16:25 +00:00
parent f14d4e7e21
commit 0ecca7a49f
36 changed files with 314 additions and 89 deletions
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15
libavcodec/snow.c
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@@ -1292,7 +1292,7 @@ void ff_spatial_idwt(DWTELEM *buffer, int width, int height, int stride, int typ
}
}
static void encode_subband_c0run(SnowContext *s, SubBand *b, DWTELEM *src, DWTELEM *parent, int stride, int orientation){
static int encode_subband_c0run(SnowContext *s, SubBand *b, DWTELEM *src, DWTELEM *parent, int stride, int orientation){
const int w= b->width;
const int h= b->height;
int x, y;
@@ -1347,6 +1347,10 @@ static void encode_subband_c0run(SnowContext *s, SubBand *b, DWTELEM *src, DWTEL
put_symbol2(&s->c, b->state[1], run, 3);
for(y=0; y<h; y++){
if(&s->c.bytestream_end - &s->c.bytestream < w*40){
av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
for(x=0; x<w; x++){
int v, p=0;
int /*ll=0, */l=0, lt=0, t=0, rt=0;
@@ -1398,12 +1402,13 @@ static void encode_subband_c0run(SnowContext *s, SubBand *b, DWTELEM *src, DWTEL
}
}
}
return 0;
}
static void encode_subband(SnowContext *s, SubBand *b, DWTELEM *src, DWTELEM *parent, int stride, int orientation){
static int encode_subband(SnowContext *s, SubBand *b, DWTELEM *src, DWTELEM *parent, int stride, int orientation){
// encode_subband_qtree(s, b, src, parent, stride, orientation);
// encode_subband_z0run(s, b, src, parent, stride, orientation);
encode_subband_c0run(s, b, src, parent, stride, orientation);
return encode_subband_c0run(s, b, src, parent, stride, orientation);
// encode_subband_dzr(s, b, src, parent, stride, orientation);
}
@@ -1918,6 +1923,10 @@ static void encode_blocks(SnowContext *s){
int h= s->b_height;
for(y=0; y<h; y++){
if(&s->c.bytestream_end - &s->c.bytestream < w*MB_SIZE*MB_SIZE*3){ //FIXME nicer limit
av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
return;
}
for(x=0; x<w; x++){
encode_q_branch(s, 0, x, y);
}