ffmpeg | branch: release/0.5 | Michael Niedermayer <michae...@gmx.at> | Wed Nov
26 15:45:47 2014 +0100| [473b0160962757c2fef9a6fedc3ff0ddeffdeef9] | committer:
Michael Niedermayer
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 <michae...@gmx.at>
(cherry picked from commit 79ceaf827be0b070675d4cd0a55c3386542defd8)
Conflicts:
libavcodec/pngdec.c
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=473b0160962757c2fef9a6fedc3ff0ddeffdeef9
---
libavcodec/pngdec.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index d583a52..e9d80f8 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -426,6 +426,12 @@ 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 = bytestream_get_be32(&s->bytestream);
s->height = bytestream_get_be32(&s->bytestream);
if(avcodec_check_dimensions(avctx, s->width, s->height)){
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