[FFmpeg-cvslog] atrac3: Fix crash in tonal component decoding.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Dec 17 03:18:58 2011 +0100| [c509f4f74713b035a06f79cb4d00e708f5226bc5] | committer: Justin Ruggles

atrac3: Fix crash in tonal component decoding.

Add a check to avoid writing past the end of the channel_unit.components[]
array.

Bug Found by: cosminamironesei
Fixes CVE-2012-0853
CC: libav-stable at libav.org

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
Signed-off-by: Justin Ruggles <justin.ruggles at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c509f4f74713b035a06f79cb4d00e708f5226bc5
---

 libavcodec/atrac3.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/libavcodec/atrac3.c b/libavcodec/atrac3.c
index fd036e7..136b16c 100644
--- a/libavcodec/atrac3.c
+++ b/libavcodec/atrac3.c
@@ -402,6 +402,8 @@ static int decodeTonalComponents (GetBitContext *gb, tonal_component *pComponent
 
             for (k=0; k<coded_components; k++) {
                 sfIndx = get_bits(gb,6);
+                if (component_count >= 64)
+                    return AVERROR_INVALIDDATA;
                 pComponent[component_count].pos = j * 64 + (get_bits(gb,6));
                 max_coded_values = SAMPLES_PER_FRAME - pComponent[component_count].pos;
                 coded_values = coded_values_per_component + 1;