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FAILED: patch "[PATCH] ipv6/sit: fix ipip6_tunnel_get_prl return value" failed to apply to 4.19-stable tree

PATCH [email protected] 1 participant 1 message Jul 4, 2022

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The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From adabdd8f6acabc0c3fdbba2e7f5a2edd9c5ef22d Mon Sep 17 00:00:00 2001
From: katrinzhou <[email protected]>
Date: Tue, 28 Jun 2022 11:50:30 +0800
Subject: [PATCH] ipv6/sit: fix ipip6_tunnel_get_prl return value

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 <[email protected]>
Reviewed-by Eric Dumazet<[email protected]>
Reviewed-by David Ahern <[email protected]>
Link https://lore.kernel.org/r/[email protected] open here
Signed-off-by Jakub Kicinski <[email protected]>
net/ipv6/sit.c +3 -5
index c0b138c20992..6bcd5e419a08 100644
@@ -323,8 +323,6 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
 		kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) :
 		NULL;
 
-	rcu_read_lock();
-
 	ca = min(t->prl_count, cmax);
 
 	if (!kp) {

@@ -341,7 +339,7 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
 		}
 	}
 
-	c = 0;
+	rcu_read_lock();
 	for_each_prl_rcu(t->prl) {
 		if (c >= cmax)
 			break;

@@ -353,7 +351,7 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
 		if (kprl.addr != htonl(INADDR_ANY))
 			break;
 	}
-out:
+
 	rcu_read_unlock();
 
 	len = sizeof(*kp) * c;

@@ -362,7 +360,7 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
 		ret = -EFAULT;
 
 	kfree(kp);
-
+out:
 	return ret;
 }