Commit 9ee93ba3 authored by Jiang Biao's avatar Jiang Biao Committed by Theodore Ts'o
Browse files

mbcache: make sure c_entry_count is not decremented past zero 



Signed-off-by: default avatarJiang Biao <jiang.biao2@zte.com.cn>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
CC: Eric Biggers <ebiggers@google.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Jan Kara <jack@suse.cz>
parent a90ac0f5

fs/mbcache.c

+3 −1
Original line number Diff line number Diff line
@@ -239,6 +239,8 @@ void mb_cache_entry_delete(struct mb_cache *cache, u32 key, u64 value) 
			spin_lock(&cache->c_list_lock);

			if (!list_empty(&entry->e_list)) {

				list_del_init(&entry->e_list);

				if (!WARN_ONCE(cache->c_entry_count == 0,

		"mbcache: attempt to decrement c_entry_count past zero"))

					cache->c_entry_count--;

				atomic_dec(&entry->e_refcnt);

			}