Fix rare UB on left-shift signed int overflow

By default, most commonly used compilers *define* some behaviour when
this overflow occurs, such that the program will continue normally,
without any negative consequences.

Severity: Minor
Fixes OSS-Fuzz#40201

parser/parse_hname2.c

@@ -32,8 +32,8 @@
 #include "keys.h"
 #include "../ut.h"  /* q_memchr */
 
-#define LOWER_BYTE(b) ((b) | 0x20)
-#define LOWER_DWORD(d) ((d) | 0x20202020)
+#define LOWER_BYTE(b) ((b) | 0x20U)
+#define LOWER_DWORD(d) ((d) | 0x20202020U)
 
 /*
  * Skip all white-chars and return position of the first
@@ -102,10 +102,10 @@ static inline char* skip_ws(char* p, char *end)
  * (Sparc for example)
  */
 #define READ(addr) \
-	(*((unsigned char *)addr + 0) + \
-	(*((unsigned char *)addr + 1) << 8) + \
-	(*((unsigned char *)addr + 2) << 16) + \
-	(*((unsigned char *)addr + 3) << 24))
+	((unsigned)*((unsigned char *)addr + 0) + \
+	 ((unsigned)*((unsigned char *)addr + 1) << 8) + \
+	 ((unsigned)*((unsigned char *)addr + 2) << 16) + \
+	 ((unsigned)*((unsigned char *)addr + 3) << 24))
 
 #ifdef FUZZ_BUILD
 /* fuzzers are sensible to heap read overflows, so enable all "HAVE" checks */