From 1bfd23d2c934db2f7fc20c1e4de5404869555991 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 26 Nov 2014 15:45:47 +0100 Subject: [PATCH] avcodec/pngdec: Check IHDR/IDAT order Fixes out of array access Fixes: asan_heap-oob_20a6c26_2690_cov_3434532168_mail.png Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer (cherry picked from commit 79ceaf827be0b070675d4cd0a55c3386542defd8) Conflicts: libavcodec/pngdec.c --- libavcodec/pngdec.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 8f3da77a2a..5e62a60318 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -576,6 +576,12 @@ static int decode_frame(AVCodecContext *avctx, case MKTAG('I', 'H', 'D', 'R'): if (length != 13) goto fail; + + if (s->state & PNG_IDAT) { + av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n"); + goto fail; + } + s->width = bytestream2_get_be32(&s->gb); s->height = bytestream2_get_be32(&s->gb); if (av_image_check_size(s->width, s->height, 0, avctx)) {