From d349ad7bb698d8d41e44e643cefcd6241ca0850d Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 19 Aug 2024 20:37:56 +0200 Subject: [PATCH] avcodec/notchlc: Check bytes left before reading Fixes: Use of uninitialized value Fixes: 71230/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_NOTCHLC_fuzzer-4624502095413248 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit b9c7f50c7de9b7d8c533eae173c9b77a6719346c) Signed-off-by: Michael Niedermayer --- libavcodec/notchlc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/notchlc.c b/libavcodec/notchlc.c index 6351a313f8..f8c104b33c 100644 --- a/libavcodec/notchlc.c +++ b/libavcodec/notchlc.c @@ -92,6 +92,9 @@ static int lz4_decompress(AVCodecContext *avctx, } while (current == 255); } + if (bytestream2_get_bytes_left(gb) < num_literals) + return AVERROR_INVALIDDATA; + if (pos + num_literals < HISTORY_SIZE) { bytestream2_get_buffer(gb, history + pos, num_literals); pos += num_literals;