From ffa2d60ac5af229268607b6530ff4e32baa1b2fa Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 3 Nov 2017 17:48:29 +0100 Subject: [PATCH] avcodec/xan: Check for bitstream end in xan_huffman_decode() Fixes: Timeout Fixes: 3707/clusterfuzz-testcase-6465922706440192 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 4b51437dccd62fc5491280db44e3c21b44aeeb3f) Signed-off-by: Michael Niedermayer --- libavcodec/xan.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/libavcodec/xan.c b/libavcodec/xan.c index 8b4ec82405..1ccf164847 100644 --- a/libavcodec/xan.c +++ b/libavcodec/xan.c @@ -131,7 +131,10 @@ static int xan_huffman_decode(uint8_t *dest, int dest_len, return ret; while (val != 0x16) { - unsigned idx = val - 0x17 + get_bits1(&gb) * byte; + unsigned idx; + if (get_bits_left(&gb) < 1) + return AVERROR_INVALIDDATA; + idx = val - 0x17 + get_bits1(&gb) * byte; if (idx >= 2 * byte) return AVERROR_INVALIDDATA; val = src[idx];