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ipv6_sockglue: Fix a missing-check bug in ip6_ra_control() 

In function ip6_ra_control(), the pointer new_ra is allocated a memory
space via kmalloc(). And it is used in the following codes. However,
when there is a memory allocation error, kmalloc() fails. Thus null
pointer dereference may happen. And it will cause the kernel to crash.
Therefore, we should check the return value and handle the error.

Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gen Zhang 2019-05-24 11:19:46 +08:00 committed by David S. Miller
parent 4097e9d250
commit 95baa60a0d
1 changed files with 2 additions and 0 deletions
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2
net/ipv6/ipv6_sockglue.c
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@ -68,6 +68,8 @@ int ip6_ra_control(struct sock *sk, int sel)
return -ENOPROTOOPT;
new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
if (sel >= 0 && !new_ra)
return -ENOMEM;
write_lock_bh(&ip6_ra_lock);
for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {