linux-kernel - [PATCH 5.4 281/344] sunrpc: Fix potential leaks in sunrpc_cache

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Message-Id: <20200221072415.283630414@linuxfoundation.org>
Date:   Fri, 21 Feb 2020 08:41:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        "J. Bruce Fields" <bfields@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 281/344] sunrpc: Fix potential leaks in sunrpc_cache_unhash()

From: Trond Myklebust <trondmy@...il.com>

[ Upstream commit 1d82163714c16ebe09c7a8c9cd3cef7abcc16208 ]

When we unhash the cache entry, we need to handle any pending upcalls
by calling cache_fresh_unlocked().

Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sunrpc/cache.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index f740cb51802af..7ede1e52fd812 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1888,7 +1888,9 @@ void sunrpc_cache_unhash(struct cache_detail *cd, struct cache_head *h)
 	if (!hlist_unhashed(&h->cache_list)){
 		hlist_del_init_rcu(&h->cache_list);
 		cd->entries--;
+		set_bit(CACHE_CLEANED, &h->flags);
 		spin_unlock(&cd->hash_lock);
+		cache_fresh_unlocked(h, cd);
 		cache_put(h, cd);
 	} else
 		spin_unlock(&cd->hash_lock);
-- 
2.20.1