Wrong decoding causes crash #1350

Wrong decoding in MySQL protocol for field bigger than 16MB causes crash.
The only code path affected by this seems to be reading parameters from
prepared statements.

include/proxysql_macros.h

@@ -42,9 +42,6 @@
 // copy 4 bytes
 #define CPY4(x) *((uint32_t *)x)
 
-// copy 8 bytes
-#define CPY8(x) *((uint64_t *)x)
-
 // (un)set blocking mode on a file descriptor
 #define ioctl_FIONBIO(fd, mode) \
 { \

lib/MySQL_Protocol.cpp

@@ -215,6 +215,12 @@ unsigned int CPY3(unsigned char *ptr) {
 	return buf.i;
 }
 
+uint64_t CPY8(unsigned char *ptr) {
+	uint64_t buf;
+	memcpy(&buf,ptr,sizeof(uint64_t));
+	return buf;
+}
+
 // see http://dev.mysql.com/doc/internals/en/integer.html#packet-Protocol::LengthEncodedInteger
 /* arguments to pass:
  * pointer to the field