linux-ext4 - [PATCH 2/2] turn BUG_ON for out of bound in mb_cache_entry_find_first/mb_cache_entry_find

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Date:	Sun, 18 Jul 2010 21:57:18 +0800
From:	Wang Sheng-Hui <crosslonelyover@...il.com>
To:	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	linux-mm@...ck.org, linux-ext4 <linux-ext4@...r.kernel.org>,
	kernel-janitors <kernel-janitors@...r.kernel.org>
Subject: [PATCH 2/2] turn BUG_ON for out of bound in mb_cache_entry_find_first/mb_cache_entry_find_next

In mb_cache_entry_find_first/mb_cache_entry_find_next, macro
mb_assert is used to do assertion on index, but it just prints
KERN_ERR info if defined.
Currently, only ext2/ext3/ext4 use the function with index set 0.
But for potential usage by other subsystems, I think we shoud report BUG
if we got some index out of bound here.


Following patch is against 2.6.35-rc3, and should be
applied after the first patch.Please check it.

Signed-off-by: Wang Sheng-Hui <crosslonelyover@...il.com>
---
 fs/mbcache.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/mbcache.c b/fs/mbcache.c
index 5697d9e..ed25979 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -614,7 +614,7 @@ mb_cache_entry_find_first(struct mb_cache *cache,
int index,
 	struct list_head *l;
 	struct mb_cache_entry *ce;

-	mb_assert(index < mb_cache_indexes(cache));
+	BUG_ON((index < 0) || (index >= mb_cache_indexes(cache)));
 	spin_lock(&mb_cache_spinlock);
 	l = cache->c_indexes_hash[index][bucket].next;
 	ce = __mb_cache_entry_find(l, &cache->c_indexes_hash[index][bucket],
@@ -652,7 +652,7 @@ mb_cache_entry_find_next(struct mb_cache_entry
*prev, int index,
 	struct list_head *l;
 	struct mb_cache_entry *ce;

-	mb_assert(index < mb_cache_indexes(cache));
+	BUG_ON((index < 0) || (index >= mb_cache_indexes(cache)));
 	spin_lock(&mb_cache_spinlock);
 	l = prev->e_indexes[index].o_list.next;
 	ce = __mb_cache_entry_find(l, &cache->c_indexes_hash[index][bucket],
-- 
1.7.1.1



-- 
Thanks and Regards,
shenghui
--
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