mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/vqavideo: Use GetByteContext and check for end
Fixes: out of array access Fixes: Timeout Fixes: 40481/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VQA_fuzzer-6502647583080448 Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
parent
86a2123a6e
commit
2877ddddda
|
@ -633,7 +633,7 @@ static int vqa_decode_frame_hicolor(VqaContext *s, AVFrame *frame)
|
|||
int vptr_chunk = -1;
|
||||
int vprz_chunk = -1;
|
||||
|
||||
const unsigned char *stream;
|
||||
GetByteContext gb_stream;
|
||||
|
||||
while (bytestream2_get_bytes_left(&s->gb) >= 8) {
|
||||
chunk_type = bytestream2_get_be32u(&s->gb);
|
||||
|
@ -717,7 +717,7 @@ static int vqa_decode_frame_hicolor(VqaContext *s, AVFrame *frame)
|
|||
|
||||
/* now uncompress the per-row RLE of the decode buffer and draw the blocks in framebuffer */
|
||||
|
||||
stream = (unsigned char*)s->decode_buffer;
|
||||
bytestream2_init(&gb_stream, s->decode_buffer, s->decode_buffer_size);
|
||||
|
||||
for (int y_pos = 0; y_pos < s->height; y_pos += s->vector_height) {
|
||||
int x_pos = 0;
|
||||
|
@ -725,9 +725,14 @@ static int vqa_decode_frame_hicolor(VqaContext *s, AVFrame *frame)
|
|||
while (x_pos < s->width) {
|
||||
int vector_index = 0;
|
||||
int count = 0;
|
||||
uint16_t code = bytestream_get_le16(&stream);
|
||||
uint16_t code;
|
||||
int type;
|
||||
|
||||
if (bytestream2_get_bytes_left(&gb_stream) < 2)
|
||||
return AVERROR_INVALIDDATA;
|
||||
|
||||
code = bytestream2_get_le16(&gb_stream);
|
||||
|
||||
type = code >> 13;
|
||||
code &= 0x1fff;
|
||||
|
||||
|
@ -742,7 +747,7 @@ static int vqa_decode_frame_hicolor(VqaContext *s, AVFrame *frame)
|
|||
count = 1;
|
||||
} else if (type < 7) {
|
||||
vector_index = code;
|
||||
count = *stream++;
|
||||
count = bytestream2_get_byte(&gb_stream);
|
||||
} else {
|
||||
av_log(s->avctx, AV_LOG_ERROR, " unknown type in VPTR chunk (%d)\n",type);
|
||||
return AVERROR_INVALIDDATA;
|
||||
|
@ -771,7 +776,7 @@ static int vqa_decode_frame_hicolor(VqaContext *s, AVFrame *frame)
|
|||
|
||||
/* we might want to read the next block index from stream */
|
||||
if ((type == 2) && count > 0) {
|
||||
vector_index = bytestream_get_byte(&stream);
|
||||
vector_index = bytestream2_get_byte(&gb_stream);
|
||||
}
|
||||
|
||||
x_pos += 4;
|
||||
|
|
Loading…
Reference in New Issue