[FFmpeg-devel] [PATCH] VP3: check that init_vlc with user-supplied data is successful
Mon Jul 6 05:12:53 CEST 2009
On Sun, Jul 05, 2009 at 12:00:29PM +0200, Reimar D?ffinger wrote:
> sample is ogv/smclock.ogv.1.101.ogv from issue 1240.
> Attached patch makes decode_init fail if the coded huffman tables are
> invalid and thus init_vlc fails.
> There remains one huge WTF: although decode_init returns -1 each and
> every time, with this command-line
> ./ffmpeg_g -i crashers/ogv/smclock.ogv.1.101.ogv -f framecrc -
> FFmpeg will still call the decode function, obviously causing a crash
> since the decoder was never correctly initialized.
> stack trace:
> ==26703== Invalid write of size 1
> ==26703== at 0x4A09F98: memset (mc_replace_strmem.c:471)
> ==26703== by 0x6B9947: vp3_decode_frame (string3.h:85)
> ==26703== by 0x493EEC: avcodec_decode_video2 (utils.c:577)
> ==26703== by 0x407226: output_packet (ffmpeg.c:1314)
> ==26703== by 0x40A3F3: av_encode (ffmpeg.c:2281)
> ==26703== by 0x40ACFB: main (ffmpeg.c:3997)
> ==26703== Address 0x0 is not stack'd, malloc'd or (recently) free'd
maybe caused by combination of try_decode_frame() and codec being non null
even on failure ...
> vp3.c | 29 +++++++++++++++++++----------
> 1 file changed, 19 insertions(+), 10 deletions(-)
> 3a53df8f442531ecbd4d4f3ff82118b5a1974698 vp3vlc_check.diff
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
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