indeo: Reject impossible FRAMETYPE_NULL

A frame marked FRAMETYPE_NULL cannot be scalable and requires a
previous frame successfully decoded.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

1 files changed, 8 insertions, 0 deletions

diff --git a/libavcodec/ivi_common.c b/libavcodec/ivi_common.c
index de9ad5542c..25ca6b7568 100644
--- a/libavcodec/ivi_common.c
+++ b/libavcodec/ivi_common.c
@@ -958,6 +958,14 @@ int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                 }
             }
         }
+    } else {
+        if (ctx->is_scalable)
+            return AVERROR_INVALIDDATA;
+
+        for (p = 0; p < 3; p++) {
+            if (!ctx->planes[p].bands[0].buf)
+                return AVERROR_INVALIDDATA;
+        }
     }
 
     //STOP_TIMER("decode_planes"); }