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

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Message-ID:
 <AS5PR06MB8752BF82AFB1C174C074547DDBA22@AS5PR06MB8752.eurprd06.prod.outlook.com>
Date: Tue, 16 Jul 2024 07:35:50 +0000
From: Tung Nguyen <tung.q.nguyen@...ava.com>
To: Shigeru Yoshida <syoshida@...hat.com>, "jmaloy@...hat.com"
	<jmaloy@...hat.com>, "ying.xue@...driver.com" <ying.xue@...driver.com>,
	"davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"tipc-discussion@...ts.sourceforge.net"
	<tipc-discussion@...ts.sourceforge.net>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [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;
Please use -EINVAL instead.
>+       }
>+
>        return 0;
> }
>
>--
>2.45.2
>

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