From ee349bd0fd5acae9eb3bc142c93aedbf0dffee3c Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 23 Nov 2018 02:33:04 +0100 Subject: [PATCH] avcodec/tiff: Limit filtering to decoded data MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Michael Niedermayer (cherry picked from commit 90ac0e5f29ba4730cd92d3268938b3730823e52b) Signed-off-by: Michael Niedermayer --- libavcodec/tiff.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c index b537ec06a5..d5b88923fd 100644 --- a/libavcodec/tiff.c +++ b/libavcodec/tiff.c @@ -1304,6 +1304,7 @@ static int decode_frame(AVCodecContext *avctx, 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) { @@ -1331,6 +1332,8 @@ static int decode_frame(AVCodecContext *avctx, 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"); @@ -1347,7 +1350,7 @@ static int decode_frame(AVCodecContext *avctx, 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; @@ -1358,13 +1361,13 @@ static int decode_frame(AVCodecContext *avctx, 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;