From 46b865ea9f86cbd12e1bf701913263c7932cccb0 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 4 Jun 2017 21:37:47 +0200 Subject: [PATCH] avcodec/qdrw: Fix null pointer dereference The RGB555 PACKBITSRGN case tries to read a palette, if such palette is actually stored then it accesses a null pointer. All 16bit samples i could find use DIRECTBITSRGN. Fixes: 2065/clusterfuzz-testcase-minimized-6298930457346048 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/qdrw.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/libavcodec/qdrw.c b/libavcodec/qdrw.c index c92cd85f12..3a0bc6f760 100644 --- a/libavcodec/qdrw.c +++ b/libavcodec/qdrw.c @@ -58,6 +58,8 @@ static int parse_palette(AVCodecContext *avctx, GetByteContext *gbc, bytestream2_skip(gbc, 6); continue; } + if (avctx->pix_fmt != AV_PIX_FMT_PAL8) + return AVERROR_INVALIDDATA; r = bytestream2_get_byte(gbc); bytestream2_skip(gbc, 1); g = bytestream2_get_byte(gbc); @@ -378,7 +380,9 @@ static int decode_frame(AVCodecContext *avctx, if ((ret = ff_get_buffer(avctx, p, 0)) < 0) return ret; - parse_palette(avctx, &gbc, (uint32_t *)p->data[1], colors); + ret = parse_palette(avctx, &gbc, (uint32_t *)p->data[1], colors); + if (ret < 0) + return ret; p->palette_has_changed = 1; /* jump to image data */