svcrpc: modifying positive sunrpc cache entries is racy

Commit Message

J. Bruce Fields Jan. 3, 2011, 10:26 p.m. UTC

None

Patch

diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index a04ac91..5edc147 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c
@@ -401,8 +401,7 @@  struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr)
 		return NULL;
 
 	if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
-		if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
-			auth_domain_put(&ipm->m_client->h);
+		ipm->h.expiry_time = 0;
 		rv = NULL;
 	} else {
 		rv = &ipm->m_client->h;