linux-kernel - [PATCH 4.9 18/29] ipv6/sit: fix ipip6_tunnel_get

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Message-Id: <20220705115606.285853914@linuxfoundation.org>
Date:   Tue,  5 Jul 2022 13:57:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, katrinzhou <katrinzhou@...cent.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 4.9 18/29] ipv6/sit: fix ipip6_tunnel_get_prl return value

From: katrinzhou <katrinzhou@...cent.com>

commit adabdd8f6acabc0c3fdbba2e7f5a2edd9c5ef22d upstream.

When kcalloc fails, ipip6_tunnel_get_prl() should return -ENOMEM.
Move the position of label "out" to return correctly.

Addresses-Coverity: ("Unused value")
Fixes: 300aaeeaab5f ("[IPV6] SIT: Add SIOCGETPRL ioctl to get/dump PRL.")
Signed-off-by: katrinzhou <katrinzhou@...cent.com>
Reviewed-by: Eric Dumazet<edumazet@...gle.com>
Reviewed-by: David Ahern <dsahern@...nel.org>
Link: https://lore.kernel.org/r/20220628035030.1039171-1-zys.zljxml@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/sit.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -308,8 +308,6 @@ static int ipip6_tunnel_get_prl(struct i
 		kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
 		NULL;
 
-	rcu_read_lock();
-
 	ca = min(t->prl_count, cmax);
 
 	if (!kp) {
@@ -325,7 +323,7 @@ static int ipip6_tunnel_get_prl(struct i
 		}
 	}
 
-	c = 0;
+	rcu_read_lock();
 	for_each_prl_rcu(t->prl) {
 		if (c >= cmax)
 			break;
@@ -337,7 +335,7 @@ static int ipip6_tunnel_get_prl(struct i
 		if (kprl.addr != htonl(INADDR_ANY))
 			break;
 	}
-out:
+
 	rcu_read_unlock();
 
 	len = sizeof(*kp) * c;
@@ -346,7 +344,7 @@ out:
 		ret = -EFAULT;
 
 	kfree(kp);
-
+out:
 	return ret;
 }