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authorJoern Engel <joern@logfs.org>2010-04-15 08:03:57 +0200
committerJoern Engel <joern@logfs.org>2010-04-15 08:03:57 +0200
commit1f1b0008e8dd1930d6e89522c70f4a438374302a (patch)
treefb35404bdb4db79925891779e3be118eca8e85dd
parentead88af5f577fd2b399a0fcdfe52605116fac489 (diff)
[LogFS] Prevent mempool_destroy NULL pointer dereference
It would probably be better to just accept NULL pointers in mempool_destroy(). But for the current -rc series let's keep things simple. This patch was lost in the cracks for a while. Kevin Cernekee <cernekee@gmail.com> had to rediscover the problem and send a similar patch because of it. :( Signed-off-by: Joern Engel <joern@logfs.org>
-rw-r--r--fs/logfs/logfs.h6
-rw-r--r--fs/logfs/readwrite.c6
-rw-r--r--fs/logfs/segment.c2
-rw-r--r--fs/logfs/super.c4
4 files changed, 11 insertions, 7 deletions
diff --git a/fs/logfs/logfs.h b/fs/logfs/logfs.h
index c9929eed80b1..0a3df1a0c936 100644
--- a/fs/logfs/logfs.h
+++ b/fs/logfs/logfs.h
@@ -727,4 +727,10 @@ static inline struct logfs_area *get_area(struct super_block *sb,
return logfs_super(sb)->s_area[(__force u8)gc_level];
}
+static inline void logfs_mempool_destroy(mempool_t *pool)
+{
+ if (pool)
+ mempool_destroy(pool);
+}
+
#endif
diff --git a/fs/logfs/readwrite.c b/fs/logfs/readwrite.c
index 7e0c39c49719..aca6c56a107a 100644
--- a/fs/logfs/readwrite.c
+++ b/fs/logfs/readwrite.c
@@ -2243,8 +2243,6 @@ void logfs_cleanup_rw(struct super_block *sb)
struct logfs_super *super = logfs_super(sb);
destroy_meta_inode(super->s_segfile_inode);
- if (super->s_block_pool)
- mempool_destroy(super->s_block_pool);
- if (super->s_shadow_pool)
- mempool_destroy(super->s_shadow_pool);
+ logfs_mempool_destroy(super->s_block_pool);
+ logfs_mempool_destroy(super->s_shadow_pool);
}
diff --git a/fs/logfs/segment.c b/fs/logfs/segment.c
index 02db22ebbf13..8c82fe05d3e1 100644
--- a/fs/logfs/segment.c
+++ b/fs/logfs/segment.c
@@ -912,7 +912,7 @@ err:
for (i--; i >= 0; i--)
free_area(super->s_area[i]);
free_area(super->s_journal_area);
- mempool_destroy(super->s_alias_pool);
+ logfs_mempool_destroy(super->s_alias_pool);
return -ENOMEM;
}
diff --git a/fs/logfs/super.c b/fs/logfs/super.c
index d6e1f4fc3115..d4531eb46d0a 100644
--- a/fs/logfs/super.c
+++ b/fs/logfs/super.c
@@ -517,8 +517,8 @@ static void logfs_kill_sb(struct super_block *sb)
if (super->s_erase_page)
__free_page(super->s_erase_page);
super->s_devops->put_device(sb);
- mempool_destroy(super->s_btree_pool);
- mempool_destroy(super->s_alias_pool);
+ logfs_mempool_destroy(super->s_btree_pool);
+ logfs_mempool_destroy(super->s_alias_pool);
kfree(super);
log_super("LogFS: Finished unmounting\n");
}