avcodec/dxv: Subtract 12 earlier in dxv_decompress_cocg()

the data_start is after reading 12 bytes and if its subtracted at the very end the intermediate might overflow Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
5 years ago · dd9e6d077e
parent c371e50b4f
commit dd9e6d077e
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/dxv.c
+++ b/libavcodec/dxv.c
@ -783,7 +783,7 @@ static int dxv_decompress_cocg(DXVContext *ctx, GetByteContext *gb,
            return ret;
    }

-    bytestream2_seek(gb, data_start + op_offset + skip0 + skip1 - 12, SEEK_SET);
+    bytestream2_seek(gb, data_start - 12 + op_offset + skip0 + skip1, SEEK_SET);

    return 0;
 }