proresdec: Fix read via negative index in a global array.

[ffmpeg] / libavcodec / proresdec2.c

diff --git a/libavcodec/proresdec2.c b/libavcodec/proresdec2.c
index fe4cfd09b862e781b49f4f2e0ae1930249b49424..9f801e447a975c041183c8764e251164f0c71e8c 100644 (file)
--- a/libavcodec/proresdec2.c
+++ b/libavcodec/proresdec2.c
@@ -302,7 +302,7 @@ static av_always_inline void decode_dc_coeffs(GetBitContext *gb, DCTELEM *out,
     code = 5;
     sign = 0;
     for (i = 1; i < blocks_per_slice; i++, out += 64) {
-        DECODE_CODEWORD(code, dc_codebook[FFMIN(code, 6)]);
+        DECODE_CODEWORD(code, dc_codebook[FFMIN(code, 6U)]);
         if(code) sign ^= -(code & 1);
         else     sign  = 0;
         prev_dc += (((code + 1) >> 1) ^ sign) - sign;