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avcodec/qtrle: Check remaining bytestream in qtrle_decode_XYbpp()

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Fixes: Timeout
Fixes: 9213/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QTRLE_fuzzer-5649753332252672

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-07-29 12:40:48 +02:00
parent 2de5209d91
commit 7dd836a3f9
1 changed files with 10 additions and 0 deletions
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10
libavcodec/qtrle.c
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@ -155,6 +155,8 @@ static inline void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr,
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (num_pixels * (bytestream2_get_byte(&s->g) - 1));
@ -210,6 +212,8 @@ static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change)
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (4 * (bytestream2_get_byte(&s->g) - 1));
@ -259,6 +263,8 @@ static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 2;
@ -303,6 +309,8 @@ static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 3;
@ -350,6 +358,8 @@ static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 4;