[PATCH 1/1] [PATCH] udhcp: Fixed aliasing compilation error and alignment issues.

[Martin Lewis]

Fixed the compilation warning:
networking/udhcp/d6_common.h:146:99: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
 #define client6_data (*(struct client6_data_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE - sizeof(struct client6_data_t)]))
                                                                                                   ^
Also fixed a possible alignment issue related to strict aliasing.

Signed-off-by: Martin Lewis <martin.lewis.x84 at gmail.com>
---
 networking/udhcp/d6_common.h | 2 +-
 networking/udhcp/d6_dhcpc.c  | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/networking/udhcp/d6_common.h b/networking/udhcp/d6_common.h
index 2178cb9..dee2558 100644
--- a/networking/udhcp/d6_common.h
+++ b/networking/udhcp/d6_common.h
@@ -141,7 +141,7 @@ struct client6_data_t {
 	unsigned env_idx;
 	/* link-local IPv6 address */
 	struct in6_addr ll_ip6;
-};
+} FIX_ALIASING;
 
 #define client6_data (*(struct client6_data_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE - sizeof(struct client6_data_t)]))
 
diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
index 6cc2316..e424ce6 100644
--- a/networking/udhcp/d6_dhcpc.c
+++ b/networking/udhcp/d6_dhcpc.c
@@ -643,7 +643,7 @@ static NOINLINE int send_d6_discover(uint32_t xid, struct in6_addr *requested_ip
 		client6_data.ia_na = xzalloc(len);
 		client6_data.ia_na->code = D6_OPT_IA_NA;
 		client6_data.ia_na->len = len - 4;
-		*(uint32_t*)client6_data.ia_na->data = rand(); /* IAID */
+		move_to_unaligned32(client6_data.ia_na->data, rand());
 		if (requested_ipv6) {
 			struct d6_option *iaaddr = (void*)(client6_data.ia_na->data + 4+4+4);
 			iaaddr->code = D6_OPT_IAADDR;
@@ -661,7 +661,7 @@ static NOINLINE int send_d6_discover(uint32_t xid, struct in6_addr *requested_ip
 		client6_data.ia_pd = xzalloc(len);
 		client6_data.ia_pd->code = D6_OPT_IA_PD;
 		client6_data.ia_pd->len = len - 4;
-		*(uint32_t*)client6_data.ia_pd->data = rand(); /* IAID */
+		move_to_unaligned32(client6_data.ia_pd->data, rand());
 		opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, len);
 	}
 
-- 
1.9.1