From 75a2db552423295b509546f3b0f8b2b46d3424b1 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 27 Jun 2018 16:12:39 +0200 Subject: [PATCH] avcodec/dpx: Check elements in 12bps planar path Fixes: null pointer dereference Fixes: 8946/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DPX_fuzzer-5078915222601728 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Carl Eugen Hoyos Signed-off-by: Michael Niedermayer --- libavcodec/dpx.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/libavcodec/dpx.c b/libavcodec/dpx.c index f75e2cbbca..cf23bb6ba1 100644 --- a/libavcodec/dpx.c +++ b/libavcodec/dpx.c @@ -395,12 +395,14 @@ static int decode_frame(AVCodecContext *avctx, if (elements == 4) *dst[3]++ = read16(&buf, endian) >> shift & 0xFFF; } else { - *dst[2]++ = read12in32(&buf, &rgbBuffer, - &n_datum, endian); + if (elements >= 3) + *dst[2]++ = read12in32(&buf, &rgbBuffer, + &n_datum, endian); *dst[0]++ = read12in32(&buf, &rgbBuffer, &n_datum, endian); - *dst[1]++ = read12in32(&buf, &rgbBuffer, - &n_datum, endian); + if (elements >= 2) + *dst[1]++ = read12in32(&buf, &rgbBuffer, + &n_datum, endian); if (elements == 4) *dst[3]++ = read12in32(&buf, &rgbBuffer, &n_datum, endian);