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SUNRPC: remove all refcounting of groupinfo from rpcauth_lookupcred 

current_cred() can only be changed by 'current', and
cred->group_info is never changed.  If a new group_info is
needed, a new 'cred' is created.

Consequently it is always safe to access
   current_cred()->group_info

without taking any further references.
So drop the refcounting and the incorrect rcu_dereference().

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
NeilBrown 2014-08-04 16:24:00 +10:00 committed by Trond Myklebust
parent 50d77739fa
commit 122a8cda6a
1 changed files with 1 additions and 7 deletions
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8
net/sunrpc/auth.c
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@ -630,14 +630,8 @@ rpcauth_lookupcred(struct rpc_auth *auth, int flags)
memset(&acred, 0, sizeof(acred));
acred.uid = cred->fsuid;
acred.gid = cred->fsgid;
if (flags & RPCAUTH_LOOKUP_RCU)
acred.group_info = rcu_dereference(cred->group_info);
else
acred.group_info = get_group_info(((struct cred *)cred)->group_info);
acred.group_info = cred->group_info;
ret = auth->au_ops->lookup_cred(auth, &acred, flags);
if (!(flags & RPCAUTH_LOOKUP_RCU))
put_group_info(acred.group_info);
return ret;
}
EXPORT_SYMBOL_GPL(rpcauth_lookupcred);