[FFmpeg-cvslog] avcodec/mjpegdec: Check number of components for JPEG-LS

[Michael Niedermayer]

ffmpeg | branch: release/1.2 | Michael Niedermayer <michaelni at gmx.at> | Wed Feb  4 20:48:30 2015 +0100| [fd6a9fcd427b86c0a249a8cdb33f746f33706725] | committer: Michael Niedermayer

avcodec/mjpegdec: Check number of components for JPEG-LS

Fixes out of array accesses
Fixes: asan_heap-oob_1c1a4ea_1242_cov_2274415971_TESTcmyk.jpg

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit fabbfaa095660982cc0bc63242c459561fa37037)

Conflicts:

	libavcodec/mjpegdec.c

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fd6a9fcd427b86c0a249a8cdb33f746f33706725
---

 libavcodec/mjpegdec.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index f04b603..fe1e5da 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -437,9 +437,12 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
     }
     if (s->ls) {
         s->upscale_h = s->upscale_v = 0;
-        if (s->nb_components > 1)
+        if (s->nb_components == 3) {
             s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
-        else if (s->bits <= 8)
+        } else if (s->nb_components != 1) {
+            av_log(s->avctx, AV_LOG_ERROR, "Unsupported number of components %d\n", s->nb_components);
+            return AVERROR_PATCHWELCOME;
+        } else if (s->bits <= 8)
             s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
         else
             s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;