summaryrefslogtreecommitdiff
path: root/net/ipv6/ip6_fib.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv6/ip6_fib.c')
-rw-r--r--net/ipv6/ip6_fib.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 31d77885bcae..6e57c03e3255 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -966,6 +966,7 @@ static void __fib6_drop_pcpu_from(struct fib6_nh *fib6_nh,
if (!fib6_nh->rt6i_pcpu)
return;
+ rcu_read_lock();
/* release the reference to this fib entry from
* all of its cached pcpu routes
*/
@@ -974,7 +975,9 @@ static void __fib6_drop_pcpu_from(struct fib6_nh *fib6_nh,
struct rt6_info *pcpu_rt;
ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
- pcpu_rt = *ppcpu_rt;
+
+ /* Paired with xchg() in rt6_get_pcpu_route() */
+ pcpu_rt = READ_ONCE(*ppcpu_rt);
/* only dropping the 'from' reference if the cached route
* is using 'match'. The cached pcpu_rt->from only changes
@@ -988,6 +991,7 @@ static void __fib6_drop_pcpu_from(struct fib6_nh *fib6_nh,
fib6_info_release(from);
}
}
+ rcu_read_unlock();
}
struct fib6_nh_pcpu_arg {