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

(cherry picked from commit 2ba963b)

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
@@ -88,8 +88,17 @@ static inline char* skip_ws(char* p, char *end)
 #include "case_repl.h"     /* Replaces */
 
 
-#define READ(val) \
-(*(val + 0) + (*(val + 1) << 8) + (*(val + 2) << 16) + (*(val + 3) << 24))
+/*
+ * Read 4-bytes from memory, as an unsigned integer
+ * Reading byte by byte ensures that the code works also on HW which
+ * does not allow reading 4-bytes at once from unaligned memory position
+ * (Sparc for example)
+ */
+#define READ(addr) \
+	((unsigned)*((unsigned char *)addr + 0) + \
+	 ((unsigned)*((unsigned char *)addr + 1) << 8) + \
+	 ((unsigned)*((unsigned char *)addr + 2) << 16) + \
+	 ((unsigned)*((unsigned char *)addr + 3) << 24))
 
 
 #define FIRST_QUATERNIONS       \