From 69aeba8a19ac2fa6e1c9bdfb19229b513f314bb1 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 4 Dec 2020 00:52:47 +0100 Subject: [PATCH] avcodec/wmaprodec: Check packet size Fixes: left shift of negative value -25824 Fixes: 27754/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XMA2_fuzzer-5760255962906624 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/wmaprodec.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c index 88ee5f4015a..8024ce16115 100644 --- a/libavcodec/wmaprodec.c +++ b/libavcodec/wmaprodec.c @@ -1721,6 +1721,12 @@ static int decode_packet(AVCodecContext *avctx, WMAProDecodeCtx *s, } } else { int frame_size; + + if (avpkt->size < s->next_packet_start) { + s->packet_loss = 1; + return AVERROR_INVALIDDATA; + } + s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3; init_get_bits(gb, avpkt->data, s->buf_bit_size); skip_bits(gb, s->packet_offset); -- 2.39.5