[FFmpeg-cvslog] avcodec/jpeg2000dec: Clip all tile coordinates

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Nov  7 02:16:11 2015 +0100| [43492ff3ab68a343c1264801baa1d5a02de10167] | committer: Michael Niedermayer

avcodec/jpeg2000dec: Clip all tile coordinates

Fixes out of array access
Fixes: b877a6b788a25c70e8b1d014f8628549/asan_heap-oob_1da2c3f_2324_5a1b329b0b3c4bb6b1d775660ac56717.r3d

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=43492ff3ab68a343c1264801baa1d5a02de10167
---

 libavcodec/jpeg2000dec.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index c8b0dab..31f3db8 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -826,10 +826,10 @@ static int init_tile(Jpeg2000DecoderContext *s, int tileno)
     if (!tile->comp)
         return AVERROR(ENOMEM);
 
-    tile->coord[0][0] = FFMAX(tilex       * s->tile_width  + s->tile_offset_x, s->image_offset_x);
-    tile->coord[0][1] = FFMIN((tilex + 1) * s->tile_width  + s->tile_offset_x, s->width);
-    tile->coord[1][0] = FFMAX(tiley       * s->tile_height + s->tile_offset_y, s->image_offset_y);
-    tile->coord[1][1] = FFMIN((tiley + 1) * s->tile_height + s->tile_offset_y, s->height);
+    tile->coord[0][0] = av_clip(tilex       * s->tile_width  + s->tile_offset_x, s->image_offset_x, s->width);
+    tile->coord[0][1] = av_clip((tilex + 1) * s->tile_width  + s->tile_offset_x, s->image_offset_x, s->width);
+    tile->coord[1][0] = av_clip(tiley       * s->tile_height + s->tile_offset_y, s->image_offset_y, s->height);
+    tile->coord[1][1] = av_clip((tiley + 1) * s->tile_height + s->tile_offset_y, s->image_offset_y, s->height);
 
     for (compno = 0; compno < s->ncomponents; compno++) {
         Jpeg2000Component *comp = tile->comp + compno;