[FFmpeg-cvslog] avcodec/mjpegdec: Fix integer overflow in shift

[Michael Niedermayer]

ffmpeg | branch: release/2.3 | Michael Niedermayer <michaelni at gmx.at> | Thu Nov 27 19:27:05 2014 +0100| [fac6ae0814c901c1f1b47f9bccac8cdf6bf4fb77] | committer: Michael Niedermayer

avcodec/mjpegdec: Fix integer overflow in shift

Fixes: signal_sigabrt_7ffff6ac7bb9_2683_cov_4120310995_m_ijpg.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 970a8f1c256f08d2f6414d573a54f2fa035c8e7a)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fac6ae0814c901c1f1b47f9bccac8cdf6bf4fb77
---

 libavcodec/mjpegdec.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index e1dff5a..7f6e054 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -244,7 +244,8 @@ int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
 
 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
 {
-    int len, nb_components, i, width, height, bits, pix_fmt_id, ret;
+    int len, nb_components, i, width, height, bits, ret;
+    unsigned pix_fmt_id;
     int h_count[MAX_COMPONENTS];
     int v_count[MAX_COMPONENTS];
 
@@ -378,7 +379,7 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
         else if (!s->lossless)
             s->rgb = 0;
     /* XXX: not complete test ! */
-    pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
+    pix_fmt_id = ((unsigned)s->h_count[0] << 28) | (s->v_count[0] << 24) |
                  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
                  (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
                  (s->h_count[3] <<  4) |  s->v_count[3];