linux-kernel - [PATCH net] tipc: Return non-zero value from tipc_udp

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Message-ID: <20240716020905.291388-1-syoshida@redhat.com>
Date: Tue, 16 Jul 2024 11:09:05 +0900
From: Shigeru Yoshida <syoshida@...hat.com>
To: jmaloy@...hat.com,
	ying.xue@...driver.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: netdev@...r.kernel.org,
	tipc-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Shigeru Yoshida <syoshida@...hat.com>
Subject: [PATCH net] tipc: Return non-zero value from tipc_udp_addr2str() on error

tipc_udp_addr2str() should return non-zero value if the UDP media
address is invalid. Otherwise, a buffer overflow access can occur in
tipc_media_addr_printf(). Fix this by returning 1 on an invalid UDP
media address.

Fixes: d0f91938bede ("tipc: add ip/udp media type")
Signed-off-by: Shigeru Yoshida <syoshida@...hat.com>
---
 net/tipc/udp_media.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index b849a3d133a0..439f75539977 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -135,8 +135,11 @@ static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
 		snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port));
 	else if (ntohs(ua->proto) == ETH_P_IPV6)
 		snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port));
-	else
+	else {
 		pr_err("Invalid UDP media address\n");
+		return 1;
+	}
+
 	return 0;
 }
 
-- 
2.45.2