This is a note to let you know that I've just added the patch titled
ceph: fix deadlock or deadcode of misusing dget()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ceph-fix-deadlock-or-deadcode-of-misusing-dget.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4c66c1a8f753532019756bc71f302cd2d5a5334c
Author: Xiubo Li <xiubli@xxxxxxxxxx>
Date: Fri Nov 17 13:26:18 2023 +0800
ceph: fix deadlock or deadcode of misusing dget()
[ Upstream commit b493ad718b1f0357394d2cdecbf00a44a36fa085 ]
The lock order is incorrect between denty and its parent, we should
always make sure that the parent get the lock first.
But since this deadcode is never used and the parent dir will always
be set from the callers, let's just remove it.
Link: https://lore.kernel.org/r/20231116081919.GZ1957730@ZenIV
Reported-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 4e88cb990723..45b8f6741f8d 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -4304,12 +4304,14 @@ int ceph_encode_dentry_release(void **p, struct dentry *dentry,
struct inode *dir,
int mds, int drop, int unless)
{
- struct dentry *parent = NULL;
struct ceph_mds_request_release *rel = *p;
struct ceph_dentry_info *di = ceph_dentry(dentry);
int force = 0;
int ret;
+ /* This shouldn't happen */
+ BUG_ON(!dir);
+
/*
* force an record for the directory caps if we have a dentry lease.
* this is racy (can't take i_ceph_lock and d_lock together), but it
@@ -4319,14 +4321,9 @@ int ceph_encode_dentry_release(void **p, struct dentry *dentry,
spin_lock(&dentry->d_lock);
if (di->lease_session && di->lease_session->s_mds == mds)
force = 1;
- if (!dir) {
- parent = dget(dentry->d_parent);
- dir = d_inode(parent);
- }
spin_unlock(&dentry->d_lock);
ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
- dput(parent);
spin_lock(&dentry->d_lock);
if (ret && di->lease_session && di->lease_session->s_mds == mds) {
