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sunrpc: only free unix grouplist after RCU settles 

While the unix_gid object is rcu-freed, the group_info list that it
contains is not. Ensure that we only put the group list reference once
we are really freeing the unix_gid object.

Reported-by: Zhi Li <yieli@redhat.com>
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2183056
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Fixes: fd5d2f7826 ("SUNRPC: Make server side AUTH_UNIX use lockless lookups")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Jeff Layton 2023-03-30 14:24:27 -04:00 committed by Chuck Lever
parent 15a8b55dbb
commit 5085e41f9e
1 changed files with 13 additions and 4 deletions
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17
net/sunrpc/svcauth_unix.c
View File

@ -416,14 +416,23 @@ static int unix_gid_hash(kuid_t uid)
return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
}
static void unix_gid_free(struct rcu_head *rcu)
{
struct unix_gid *ug = container_of(rcu, struct unix_gid, rcu);
struct cache_head *item = &ug->h;
if (test_bit(CACHE_VALID, &item->flags) &&
!test_bit(CACHE_NEGATIVE, &item->flags))
put_group_info(ug->gi);
kfree(ug);
}
static void unix_gid_put(struct kref *kref)
{
struct cache_head *item = container_of(kref, struct cache_head, ref);
struct unix_gid *ug = container_of(item, struct unix_gid, h);
if (test_bit(CACHE_VALID, &item->flags) &&
!test_bit(CACHE_NEGATIVE, &item->flags))
put_group_info(ug->gi);
kfree_rcu(ug, rcu);
call_rcu(&ug->rcu, unix_gid_free);
}
static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)