netdev - [PATCH v2] net: tipc: fix possible infoleak in tipc_mon

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Date:   Tue, 28 Jun 2022 16:31:22 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     jmaloy@...hat.com, ying.xue@...driver.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        tung.q.nguyen@...tech.com.au
Cc:     netdev@...r.kernel.org, tipc-discussion@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH v2] net: tipc: fix possible infoleak in tipc_mon_rcv()

dom_bef is use to cache current domain record only if current domain
exists. But when current domain does not exist, dom_bef will still be used
in mon_identify_lost_members. This may lead to an information leak.

Fix this by adding a memset before using dom_bef.

Fixes: 35c55c9877f8 ("tipc: add neighbor monitoring framework")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---

v2: remove redundant 'dom_bef.member_cnt = 0;'

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

diff --git a/net/tipc/monitor.c b/net/tipc/monitor.c
index 2f4d23238a7e..03b5d0b65169 100644
--- a/net/tipc/monitor.c
+++ b/net/tipc/monitor.c
@@ -534,7 +534,7 @@ void tipc_mon_rcv(struct net *net, void *data, u16 dlen, u32 addr,
 	state->peer_gen = new_gen;
 
 	/* Cache current domain record for later use */
-	dom_bef.member_cnt = 0;
+	memset(&dom_bef, 0, sizeof(dom_bef));
 	dom = peer->domain;
 	if (dom)
 		memcpy(&dom_bef, dom, dom->len);
-- 
2.25.1