From 6a1664950d2cd3086a0e7276b06dc1d434d64c6a Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 3 Aug 2025 14:39:53 +0200 Subject: [PATCH] avcodec/imc: Clear padding of buf16 Fixes: use of uninitialized memory Fixes: 423673969/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IAC_fuzzer-6685890556788736 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 715df4b1ff398758ca1b8a82c3d16940bc63fc56) Signed-off-by: Michael Niedermayer --- libavcodec/imc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavcodec/imc.c b/libavcodec/imc.c index 5891e3621a..72c4c6ff89 100644 --- a/libavcodec/imc.c +++ b/libavcodec/imc.c @@ -966,6 +966,8 @@ static int imc_decode_frame(AVCodecContext *avctx, AVFrame *frame, LOCAL_ALIGNED_16(uint16_t, buf16, [(IMC_BLOCK_SIZE + AV_INPUT_BUFFER_PADDING_SIZE) / 2]); + memset(buf16 + IMC_BLOCK_SIZE/2, 0, AV_INPUT_BUFFER_PADDING_SIZE); + q->avctx = avctx; if (buf_size < IMC_BLOCK_SIZE * avctx->ch_layout.nb_channels) {