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Fix potential pointer arithmetic overflows in the Electronic Arts CMV decoder. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Laurent Aimar 2011-10-01 00:44:59 +02:00 committed by Michael Niedermayer
parent 39993860e1
commit e9064c9ce8
1 changed files with 4 additions and 4 deletions
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8
libavcodec/eacmv.c
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@ -56,7 +56,7 @@ static void cmv_decode_intra(CmvContext * s, const uint8_t *buf, const uint8_t *
unsigned char *dst = s->frame.data[0];
int i;
for (i=0; i < s->avctx->height && buf+s->avctx->width<=buf_end; i++) {
for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
memcpy(dst, buf, s->avctx->width);
dst += s->frame.linesize[0];
buf += s->avctx->width;
@ -88,7 +88,7 @@ static void cmv_decode_inter(CmvContext * s, const uint8_t *buf, const uint8_t *
i = 0;
for(y=0; y<s->avctx->height/4; y++)
for(x=0; x<s->avctx->width/4 && buf+i<buf_end; x++) {
for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
if (buf[i]==0xFF) {
unsigned char *dst = s->frame.data[0] + (y*4)*s->frame.linesize[0] + x*4;
if (raw+16<buf_end && *raw==0xFF) { /* intra */
@ -122,7 +122,7 @@ static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t
{
int pal_start, pal_count, i;
if(buf+16>=buf_end) {
if(buf_end - buf < 16) {
av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
return;
}
@ -139,7 +139,7 @@ static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t
pal_count = AV_RL16(&buf[14]);
buf += 16;
for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf+2<buf_end; i++) {
for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
s->palette[i] = AV_RB24(buf);
buf += 3;
}