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Subject[PATCH] ipv6/sit: fix ipip6_tunnel_get_prl when memory allocation fails
Date
From: katrinzhou <katrinzhou@tencent.com>

Fix an illegal copy_to_user() attempt when the system fails to
allocate memory for prl due to a lack of memory.

Addresses-Coverity: ("Unused value")
Fixes: 300aaeeaab5f ("[IPV6] SIT: Add SIOCGETPRL ioctl to get/dump PRL.")
Signed-off-by: katrinzhou <katrinzhou@tencent.com>
---
net/ipv6/sit.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index c0b138c20992..4fb84c0b30be 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -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) {
@@ -337,11 +335,12 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
__GFP_NOWARN);
if (!kp) {
ret = -ENOMEM;
- goto out;
+ goto err;
}
}

c = 0;
+ rcu_read_lock();
for_each_prl_rcu(t->prl) {
if (c >= cmax)
break;
@@ -362,7 +361,7 @@ static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __u
ret = -EFAULT;

kfree(kp);
-
+err:
return ret;
}

--
2.27.0
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