X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fxan.c;h=1ccf164847bb70aa963534b399cebd84ac4bf720;hb=09100ccc14690a9d781f055642b5b880752ee636;hp=8b4ec82405c0790c13d90b92a4eee90adf1bc1fc;hpb=6c35f890678346ae91d318c17da84f1894e0c127;p=ffmpeg

diff --git a/libavcodec/xan.c b/libavcodec/xan.c
index 8b4ec82405c..1ccf164847b 100644
--- a/libavcodec/xan.c
+++ b/libavcodec/xan.c
@@ -131,7 +131,10 @@ static int xan_huffman_decode(uint8_t *dest, int dest_len,
         return ret;
 
     while (val != 0x16) {
-        unsigned idx = val - 0x17 + get_bits1(&gb) * byte;
+        unsigned idx;
+        if (get_bits_left(&gb) < 1)
+            return AVERROR_INVALIDDATA;
+        idx = val - 0x17 + get_bits1(&gb) * byte;
         if (idx >= 2 * byte)
             return AVERROR_INVALIDDATA;
         val = src[idx];