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sit: use __GFP_NOWARN for user controlled allocation 

The memory allocation size is controlled by user-space,
if it is too large just fail silently and return NULL,
not to mention there is a fallback allocation later.

Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2017-06-22 15:29:33 -07:00 committed by David S. Miller
parent a5cb659bbc
commit 0ccc22f425
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/sit.c
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@ -305,7 +305,7 @@ static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
* we try harder to allocate. * we try harder to allocate.
*/ */
kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) :
NULL; NULL;
rcu_read_lock(); rcu_read_lock();