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quickdraw: Check for out of bound reads 

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
This commit is contained in:
Laurent Aimar 2011-09-29 23:13:35 +00:00 committed by Janne Grunau
parent e3ca9b93d9
commit 4fd56f842c
1 changed files with 12 additions and 0 deletions
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12
libavcodec/qdrw.c
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@ -37,6 +37,7 @@ static int decode_frame(AVCodecContext *avctx,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
const uint8_t *buf_end = avpkt->data + avpkt->size;
int buf_size = avpkt->size;
QdrawContext * const a = avctx->priv_data;
AVFrame * const p= (AVFrame*)&a->pic;
@ -59,6 +60,8 @@ static int decode_frame(AVCodecContext *avctx,
outdata = a->pic.data[0];
if (buf_end - buf < 0x68 + 4)
return AVERROR_INVALIDDATA;
buf += 0x68; /* jump to palette */
colors = AV_RB32(buf);
buf += 4;
@ -67,6 +70,8 @@ static int decode_frame(AVCodecContext *avctx,
av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors);
return -1;
}
if (buf_end - buf < (colors + 1) * 8)
return AVERROR_INVALIDDATA;
pal = (uint32_t*)p->data[1];
for (i = 0; i <= colors; i++) {
@ -89,6 +94,8 @@ static int decode_frame(AVCodecContext *avctx,
}
p->palette_has_changed = 1;
if (buf_end - buf < 18)
return AVERROR_INVALIDDATA;
buf += 18; /* skip unneeded data */
for (i = 0; i < avctx->height; i++) {
int size, left, code, pix;
@ -100,6 +107,9 @@ static int decode_frame(AVCodecContext *avctx,
out = outdata;
size = AV_RB16(buf); /* size of packed line */
buf += 2;
if (buf_end - buf < size)
return AVERROR_INVALIDDATA;
left = size;
next = buf + size;
while (left > 0) {
@ -115,6 +125,8 @@ static int decode_frame(AVCodecContext *avctx,
} else { /* copy */
if ((out + code) > (outdata + a->pic.linesize[0]))
break;
if (buf_end - buf < code + 1)
return AVERROR_INVALIDDATA;
memcpy(out, buf, code + 1);
out += code + 1;
buf += code + 1;