PR #21706 opened by michaelni URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21706 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21706.patch
Fixes: Timeout Fixes: 471605680/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLASHSV2_DEC_fuzzer-6210773459468288 Fixes: 471605920/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLASHSV_DEC_fuzzer-6230719287590912 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <[email protected]> >From 164e3ff9ef9cd8f550c0972d62822a055632897e Mon Sep 17 00:00:00 2001 From: Michael Niedermayer <[email protected]> Date: Tue, 10 Feb 2026 02:37:58 +0100 Subject: [PATCH] avcodec/flashsv: Check for input space before (re)allocating frame Fixes: Timeout Fixes: 471605680/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLASHSV2_DEC_fuzzer-6210773459468288 Fixes: 471605920/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLASHSV_DEC_fuzzer-6230719287590912 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <[email protected]> --- libavcodec/flashsv.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/flashsv.c b/libavcodec/flashsv.c index d27918c923..ba5c995006 100644 --- a/libavcodec/flashsv.c +++ b/libavcodec/flashsv.c @@ -314,6 +314,9 @@ static int flashsv_decode_frame(AVCodecContext *avctx, AVFrame *rframe, v_blocks = s->image_height / s->block_height; v_part = s->image_height % s->block_height; + if (h_blocks * v_blocks * 16 > get_bits_left(&gb)) + return AVERROR_INVALIDDATA; + /* the block size could change between frames, make sure the buffer * is large enough, if not, get a larger one */ if (s->block_size < s->block_width * s->block_height) { -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
