cast to unsigned first to appease ubsan (oss-fuzz)

diff --git a/src/encoding.c b/src/encoding.c
index 8d84669c1dbf80f78ba392185c7e5e3f1dca608e..b8c2230d4749bef02b4c06cd0911fac8df43496b 100644 (file)
--- a/src/encoding.c
+++ b/src/encoding.c
@@ -35,7 +35,7 @@
 #include "file.h"
 
 #ifndef        lint
-FILE_RCSID("@(#)$File: encoding.c,v 1.18 2019/02/20 16:15:47 christos Exp $")
+FILE_RCSID("@(#)$File: encoding.c,v 1.19 2019/02/23 21:54:05 christos Exp $")
 #endif /* lint */
 
 #include "magic.h"
@@ -481,11 +481,11 @@ looks_ucs32(const unsigned char *bf, size_t nbytes, unichar *ubf,
                if (bigend)
                        ubf[(*ulen)++] = bf[i + 3] | (bf[i + 2] << 8)
                            | (bf[i + 1] << 16)
-                           | CAST(unichar, bf[i] << 24);
+                           | (CAST(unichar, bf[i]) << 24);
                else
                        ubf[(*ulen)++] = bf[i] | (bf[i + 1] << 8) 
                            | (bf[i + 2] << 16)
-                           | CAST(unichar, bf[i + 3] << 24);
+                           | (CAST(unichar, bf[i + 3]) << 24);
 
                if (ubf[*ulen - 1] == 0xfffe)
                        return 0;