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vorbisdec: Error on bark_map_size equal to 0.

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The value is used to calculate output LSP curve and a division by zero
and out of array accesses would occur.

CVE-2013-0894

CC: libav-stable@libav.org

Reported-by: Dale Curtis <dalecurtis@chromium.org>
Found-by: inferno@chromium.org
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
(cherry picked from commit 11dcecfcca)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit 494ddd377a)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Michael Niedermayer 2013-01-11 00:54:12 +01:00 committed by Reinhard Tartler
parent c313f3160a
commit d86a5ce03f
1 changed files with 5 additions and 0 deletions
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5
libavcodec/vorbisdec.c
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@ -572,6 +572,11 @@ static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
floor_setup->data.t0.order = get_bits(gb, 8);
floor_setup->data.t0.rate = get_bits(gb, 16);
floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
if (floor_setup->data.t0.bark_map_size == 0) {
av_log(vc->avccontext, AV_LOG_ERROR,
"Floor 0 bark map size is 0.\n");
return AVERROR_INVALIDDATA;
}
floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
/* zero would result in a div by zero later *
* 2^0 - 1 == 0 */