dfa: fix out of array write in decode_wdlt()

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-04-13 22:52:16 +02:00 · 2012-04-13 22:52:16 +02:00 · d1c95d2ce3
commit d1c95d2ce3
parent 367d9b2957
1 changed files with 2 additions and 0 deletions
--- a/libavcodec/dfa.c
+++ b/libavcodec/dfa.c
@ -242,6 +242,8 @@ static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height
            frame    += delta;
            segments = bytestream2_get_le16(gb);
        }
+        if (frame_end <= frame)
+            return -1;
        if (segments & 0x8000) {
            frame[width - 1] = segments & 0xFF;
            segments = bytestream2_get_le16(gb);