Ensure that width and height are > 0. avcodec_open() itself only checks that

they are >= 0.

Patch by Sebastian Vater <cdgs basty googlemail com>.

Originally committed as revision 23080 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/iff.c

@@ -115,6 +115,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
         return AVERROR_INVALIDDATA;
     }
 
+    if ((err = avcodec_check_dimensions(avctx, avctx->width, avctx->height)))
+        return err;
     s->planesize = FFALIGN(avctx->width, 16) >> 3; // Align plane size in bits to word-boundary
     s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
     if (!s->planebuf)