X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fescape124.c;h=cffd3e12b1ad755408db93dbd0cd2f84661f5d09;hb=c0ee4e0ac2c46bb4904ceec12b7dfa480517e7bf;hp=eb051eba54a5a006aafc86f089b3b940cf2db096;hpb=77eba7bd99355fc37a2bfc9d0224218f4022762c;p=ffmpeg

diff --git a/libavcodec/escape124.c b/libavcodec/escape124.c
index eb051eba54a..cffd3e12b1a 100644
--- a/libavcodec/escape124.c
+++ b/libavcodec/escape124.c
@@ -221,7 +221,11 @@ static int escape124_decode_frame(AVCodecContext *avctx,
 
     // This call also guards the potential depth reads for the
     // codebook unpacking.
-    if (get_bits_left(&gb) < 64)
+    // Check if the amount we will read minimally is available on input.
+    // The 64 represent the immediately next 2 frame_* elements read, the 23/4320
+    // represent a lower bound of the space needed for skipped superblocks. Non
+    // skipped SBs need more space.
+    if (get_bits_left(&gb) < 64 + s->num_superblocks * 23LL / 4320)
         return -1;
 
     frame_flags = get_bits_long(&gb, 32);