Commit 7caf333c authored Jan 09, 2018 by Jiang Biao Committed by Gagan Malvi Apr 18, 2021

mbcache: make sure c_entry_count is not decremented past zero



Change-Id: I86faa14a18ad7a1c1b9d790eee79cc54660e628a
Signed-off-by: Jiang Biao <jiang.biao2@zte.com.cn>
Signed-off-by: Theodore 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 c29704ed

fs/mbcache.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -238,6 +238,8 @@ 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);
		}