netdev - [PATCH iproute2] ila: fix array overflow warning

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Date: Wed,  4 Oct 2023 10:02:58 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: netdev@...r.kernel.org
Cc: Stephen Hemminger <stephen@...workplumber.org>
Subject: [PATCH iproute2] ila: fix array overflow warning

Aliasing a 64 bit value seems to confuse Gcc 12.2.
ipila.c:57:32: warning: ‘addr’ may be used uninitialized [-Wmaybe-uninitialized]

Use a union instead.

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
---
 ip/ipila.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/ip/ipila.c b/ip/ipila.c
index 23b19a108862..f4387e039f97 100644
--- a/ip/ipila.c
+++ b/ip/ipila.c
@@ -47,14 +47,17 @@ static int genl_family = -1;
 
 static void print_addr64(__u64 addr, char *buff, size_t len)
 {
-	__u16 *words = (__u16 *)&addr;
+	union {
+		__u64 id64;
+		__u16 words[4];
+	} id = { .id64 = addr };
 	__u16 v;
 	int i, ret;
 	size_t written = 0;
 	char *sep = ":";
 
 	for (i = 0; i < 4; i++) {
-		v = ntohs(words[i]);
+		v = ntohs(id.words[i]);
 
 		if (i == 3)
 			sep = "";
-- 
2.39.2