linux-kernel - Re: [PATCH net] ax25: Fix refcount leak issues of ax25

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Date: Fri, 3 May 2024 23:36:37 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Lars Kellogg-Stedman <lars@...bit.com>
Cc: Duoming Zhou <duoming@....edu.cn>, linux-hams@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	pabeni@...hat.com, kuba@...nel.org, edumazet@...gle.com,
	davem@...emloft.net, jreuter@...na.de
Subject: Re: [PATCH net] ax25: Fix refcount leak issues of ax25_dev

Could you test this diff?

regards,
dan carpenter

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 558e158c98d0..a7f96a4ceff4 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1129,8 +1129,10 @@ static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 	/*
 	 * User already set interface with SO_BINDTODEVICE
 	 */
-	if (ax25->ax25_dev != NULL)
+	if (ax25->ax25_dev != NULL) {
+		ax25_dev_hold(ax25->ax25_dev);
 		goto done;
+	}
 
 	if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
 		if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&