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avcodec/flashsv: Check for input space before (re)allocating frame

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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 <michael@niedermayer.cc>
(cherry picked from commit 4446dfb0e3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2026-02-10 02:37:58 +01:00
parent 0b1b176361
commit ffd7599c80
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1 changed files with 3 additions and 0 deletions
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libavcodec/flashsv.c
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@ -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) {