linux-ext4 - [ext4] extent tree es

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Date:	Tue, 30 Apr 2013 00:59:19 -0400
From:	"Jon ERNST" <jonernst@....com>
To:	linux-ext4@...r.kernel.org
Subject: [ext4] extent tree es_len can be zero?

Hi ,list,

extent tree es_len can be zero?
if we call ext4_es_end when es_len is zero, it will have problem.


diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index 95796a1..49a8da2 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -108,7 +108,7 @@
  *     tree are ordered by logical block no.
  *
  *   --        operations on a extent status tree
- *     There are three important operations on a delayed extent tree: find
+ *     There are three important operations on a delayed extent tree: finding
  *     next extent, adding a extent(a range of blocks) and removing a extent.
  *
  *   --        race on a extent status tree
@@ -195,7 +195,7 @@ static void ext4_es_print_tree(struct inode *inode)
 
 static inline ext4_lblk_t ext4_es_end(struct extent_status *es)
 {
-       BUG_ON(es->es_lblk + es->es_len < es->es_lblk);
+       BUG_ON(es->es_lblk + es->es_len <= es->es_lblk);
        return es->es_lblk + es->es_len - 1;
 }
--
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