diff options
| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2020-04-25 20:52:26 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-27 17:46:30 +0200 |
| commit | dcec6678c3b10ac2c31aaf72ff1d0355ec0aec11 (patch) | |
| tree | b21faf8082cb9739c1cad545415b8c3b3511aca0 /fs | |
| parent | 2b52a61adb38539d65af19ebb28ff0dab4be3ade (diff) | |
configfs: fix config_item refcnt leak in configfs_rmdir()
[ Upstream commit 8aebfffacfa379ba400da573a5bf9e49634e38cb ]
configfs_rmdir() invokes configfs_get_config_item(), which returns a
reference of the specified config_item object to "parent_item" with
increased refcnt.
When configfs_rmdir() returns, local variable "parent_item" becomes
invalid, so the refcount should be decreased to keep refcount balanced.
The reference counting issue happens in one exception handling path of
configfs_rmdir(). When down_write_killable() fails, the function forgets
to decrease the refcnt increased by configfs_get_config_item(), causing
a refcnt leak.
Fix this issue by calling config_item_put() when down_write_killable()
fails.
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/configfs/dir.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index cf7b7e1d5bd7..cb733652ecca 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -1519,6 +1519,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) spin_lock(&configfs_dirent_lock); configfs_detach_rollback(dentry); spin_unlock(&configfs_dirent_lock); + config_item_put(parent_item); return -EINTR; } frag->frag_dead = true; |