linux-kernel - [PATCH net v2] net: tipc: avoid possible garbage value

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Message-Id: <20240914102620.1411089-1-suhui@nfschina.com>
Date: Sat, 14 Sep 2024 18:26:21 +0800
From: Su Hui <suhui@...china.com>
To: jmaloy@...hat.com,
	ying.xue@...driver.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	nathan@...nel.org,
	ndesaulniers@...gle.com,
	morbo@...gle.com,
	justinstitt@...gle.com
Cc: Su Hui <suhui@...china.com>,
	horms@...nel.org,
	dan.carpenter@...aro.org,
	tuong.t.lien@...tech.com.au,
	netdev@...r.kernel.org,
	tipc-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev,
	kernel-janitors@...r.kernel.org
Subject: [PATCH net v2] net: tipc: avoid possible garbage value

Clang static checker (scan-build) warning:
net/tipc/bcast.c:305:4:
The expression is an uninitialized value. The computed value will also
be garbage [core.uninitialized.Assign]
  305 |                         (*cong_link_cnt)++;
      |                         ^~~~~~~~~~~~~~~~~~

tipc_rcast_xmit() will increase cong_link_cnt's value, but cong_link_cnt
is uninitialized. Although it won't really cause a problem, it's better
to fix it.

Fixes: dca4a17d24ee ("tipc: fix potential hanging after b/rcast changing")
Signed-off-by: Su Hui <suhui@...china.com>
Reviewed-by: Justin Stitt <justinstitt@...gle.com>
---
v2:
- sending to net rather than net-next
- keeping xmas tree order

 net/tipc/bcast.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 593846d25214..114fef65f92e 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -320,8 +320,8 @@ static int tipc_mcast_send_sync(struct net *net, struct sk_buff *skb,
 {
 	struct tipc_msg *hdr, *_hdr;
 	struct sk_buff_head tmpq;
+	u16 cong_link_cnt = 0;
 	struct sk_buff *_skb;
-	u16 cong_link_cnt;
 	int rc = 0;
 
 	/* Is a cluster supporting with new capabilities ? */
-- 
2.30.2