[FFmpeg-cvslog] avcodec/tiff: Limit filtering to decoded data
Michael Niedermayer
git at videolan.org
Mon Nov 26 04:09:00 EET 2018
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Nov 23 02:33:04 2018 +0100| [90ac0e5f29ba4730cd92d3268938b3730823e52b] | committer: Michael Niedermayer
avcodec/tiff: Limit filtering to decoded data
Fixes: Timeout
Fixes: 11068/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5698456681709568
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Tomas Härdin <tjoppen at acc.umu.se>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=90ac0e5f29ba4730cd92d3268938b3730823e52b
---
libavcodec/tiff.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index 74b76c9fdf..6271c937c3 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -1421,6 +1421,7 @@ again:
planes = s->planar ? s->bppcount : 1;
for (plane = 0; plane < planes; plane++) {
int remaining = avpkt->size;
+ int decoded_height;
stride = p->linesize[plane];
dst = p->data[plane];
for (i = 0; i < s->height; i += s->rps) {
@@ -1448,6 +1449,8 @@ again:
break;
}
}
+ decoded_height = FFMIN(i, s->height);
+
if (s->predictor == 2) {
if (s->photometric == TIFF_PHOTOMETRIC_YCBCR) {
av_log(s->avctx, AV_LOG_ERROR, "predictor == 2 with YUV is unsupported");
@@ -1464,7 +1467,7 @@ again:
s->avctx->pix_fmt == AV_PIX_FMT_YA16LE ||
s->avctx->pix_fmt == AV_PIX_FMT_GBRP16LE ||
s->avctx->pix_fmt == AV_PIX_FMT_GBRAP16LE) {
- for (i = 0; i < s->height; i++) {
+ for (i = 0; i < decoded_height; i++) {
for (j = soff; j < ssize; j += 2)
AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));
dst += stride;
@@ -1475,13 +1478,13 @@ again:
s->avctx->pix_fmt == AV_PIX_FMT_YA16BE ||
s->avctx->pix_fmt == AV_PIX_FMT_GBRP16BE ||
s->avctx->pix_fmt == AV_PIX_FMT_GBRAP16BE) {
- for (i = 0; i < s->height; i++) {
+ for (i = 0; i < decoded_height; i++) {
for (j = soff; j < ssize; j += 2)
AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));
dst += stride;
}
} else {
- for (i = 0; i < s->height; i++) {
+ for (i = 0; i < decoded_height; i++) {
for (j = soff; j < ssize; j++)
dst[j] += dst[j - soff];
dst += stride;
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