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Merge commit '8aba7968dd604aae91ee42cbce0be3dad7dceb30'

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* commit '8aba7968dd604aae91ee42cbce0be3dad7dceb30':
  vcr1: add sanity checks

Conflicts:
	libavcodec/vcr1.c

See: 845724c82c
See: 8e09482e4d
Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2013-09-03 13:17:20 +02:00
parent 92b7e7b318 8aba7968dd
commit 8ba683e629
1 changed files with 19 additions and 2 deletions
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21
libavcodec/vcr1.c
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@@ -38,9 +38,10 @@ static av_cold int vcr1_decode_init(AVCodecContext *avctx)
avctx->pix_fmt = AV_PIX_FMT_YUV410P; avctx->pix_fmt = AV_PIX_FMT_YUV410P;
if (avctx->width % 8 || avctx->height%4) { if (avctx->width % 8 || avctx->height%4) {
avpriv_request_sample(avctx, "odd dimensions support"); avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height);
return AVERROR_PATCHWELCOME; return AVERROR_INVALIDDATA;
} }
return 0; return 0;
} }
@@ -64,9 +65,13 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
p->pict_type = AV_PICTURE_TYPE_I; p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1; p->key_frame = 1;
if (buf_size < 32)
goto packet_small;
for (i = 0; i < 16; i++) { for (i = 0; i < 16; i++) {
a->delta[i] = *bytestream++; a->delta[i] = *bytestream++;
bytestream++; bytestream++;
buf_size--;
} }
for (y = 0; y < avctx->height; y++) { for (y = 0; y < avctx->height; y++) {
@@ -77,8 +82,12 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]]; uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]]; uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
if (buf_size < 4 + avctx->width)
goto packet_small;
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
a->offset[i] = *bytestream++; a->offset[i] = *bytestream++;
buf_size -= 4;
offset = a->offset[0] - a->delta[bytestream[2] & 0xF]; offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
for (x = 0; x < avctx->width; x += 4) { for (x = 0; x < avctx->width; x += 4) {
@@ -92,8 +101,12 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
*cr++ = bytestream[1]; *cr++ = bytestream[1];
bytestream += 4; bytestream += 4;
buf_size -= 4;
} }
} else { } else {
if (buf_size < avctx->width / 2)
goto packet_small;
offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF]; offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
for (x = 0; x < avctx->width; x += 8) { for (x = 0; x < avctx->width; x += 8) {
@@ -107,6 +120,7 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
luma[7] = offset += a->delta[bytestream[1] >> 4]; luma[7] = offset += a->delta[bytestream[1] >> 4];
luma += 8; luma += 8;
bytestream += 4; bytestream += 4;
buf_size -= 4;
} }
} }
} }
@@ -114,6 +128,9 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
*got_frame = 1; *got_frame = 1;
return buf_size; return buf_size;
packet_small:
av_log(avctx, AV_LOG_ERROR, "Input packet too small.\n");
return AVERROR_INVALIDDATA;
} }
AVCodec ff_vcr1_decoder = { AVCodec ff_vcr1_decoder = {