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avcodec/utvideodec: Add several out of array read related checks 

Fixes: OV_decode_plane.avi

Found-by: GwanYeong Kim <gy741.kim@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-09 15:27:41 +01:00
parent 66acb63028
commit 76cc0f0f67
1 changed files with 10 additions and 4 deletions
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14
libavcodec/utvideodec.c
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@ -268,6 +268,9 @@ static int decode_plane(UtvideoContext *c, int plane_no,
send = (height * (slice + 1) / c->slices) & cmask;
dest = dst + sstart * stride;
if (3 * ((dst + send * stride - dest + 7)/8) > get_bits_left(&cbit))
return AVERROR_INVALIDDATA;
for (p = dest; p < dst + send * stride; p += 8) {
int bits = get_bits_le(&cbit, 3);
@ -277,6 +280,9 @@ static int decode_plane(UtvideoContext *c, int plane_no,
uint32_t sub = 0x80 >> (8 - (bits + 1)), add;
int k;
if ((bits + 1) * 8 > get_bits_left(&pbit))
return AVERROR_INVALIDDATA;
for (k = 0; k < 8; k++) {
p[k] = get_bits_le(&pbit, bits + 1);
@ -639,9 +645,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
for (j = 0; j < c->slices; j++) {
c->packed_stream[i][j] = packed_stream;
c->packed_stream_size[i][j] = bytestream2_get_le32(&pb);
left -= c->packed_stream_size[i][j];
if (left < 0)
if (c->packed_stream_size[i][j] > left)
return AVERROR_INVALIDDATA;
left -= c->packed_stream_size[i][j];
packed_stream += c->packed_stream_size[i][j];
}
}
@ -652,9 +658,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
for (j = 0; j < c->slices; j++) {
c->control_stream[i][j] = control_stream;
c->control_stream_size[i][j] = bytestream2_get_le32(&pb);
left -= c->control_stream_size[i][j];
if (left < 0)
if (c->control_stream_size[i][j] > left)
return AVERROR_INVALIDDATA;
left -= c->control_stream_size[i][j];
control_stream += c->control_stream_size[i][j];
}
}