[PATCH] Fix reiserfs deadlock

reiserfs_cache_default_acl() should return whether we successfully found
the acl or not.  We have to return correct value even if reiserfs_get_acl()
returns error code and not just 0.  Otherwise callers such as
reiserfs_mkdir() can unnecessarily lock the xattrs and later functions such
as reiserfs_new_inode() fail to notice that we have already taken the lock
and try to take it again with obvious consequences.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: <reiserfs-dev@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index 58c418fbca2c..97ae1b92bc47 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -408,8 +408,9 @@ int reiserfs_cache_default_acl(struct inode *inode)
                 acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
                 reiserfs_read_unlock_xattrs(inode->i_sb);
                 reiserfs_read_unlock_xattr_i(inode);
-                ret = acl ? 1 : 0;
-                posix_acl_release(acl);
+                ret = (acl && !IS_ERR(acl));
+                if (ret)
+                        posix_acl_release(acl);
         }
 
         return ret;