From ae021c1239ec3bc0a30dc5a4720569071599ece4 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 24 Jun 2019 01:01:02 +0200 Subject: [PATCH] avcodec/qdm2: Do not read out of array in fix_coding_method_array() Instead we ask for a sample, its unclear what to do in this case. Fixes: index 30 out of bounds for type 'int8_t [30][64]' Fixes: 15339/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QDM2_fuzzer-5749441484554240 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/qdm2.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c index 1397218bdd..44ff4fa6c6 100644 --- a/libavcodec/qdm2.c +++ b/libavcodec/qdm2.c @@ -408,7 +408,12 @@ static int fix_coding_method_array(int sb, int channels, } for (k = 0; k < run; k++) { if (j + k < 128) { - if (coding_method[ch][sb + (j + k) / 64][(j + k) % 64] > coding_method[ch][sb][j]) { + int sbjk = sb + (j + k) / 64; + if (sbjk > 29) { + SAMPLES_NEEDED + continue; + } + if (coding_method[ch][sbjk][(j + k) % 64] > coding_method[ch][sb][j]) { if (k > 0) { SAMPLES_NEEDED //not debugged, almost never used