[PATCH] cifs: Fix memory leak on the deferred close

From: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
To: <linux-cifs@vger.kernel.org>, <zhangxiaoxu5@huawei.com>,
	<sfrench@samba.org>, <pc@cjr.nz>, <lsahlber@redhat.com>,
	<sprasad@microsoft.com>, <rohiths@microsoft.com>
Subject: [PATCH] cifs: Fix memory leak on the deferred close
Date: Thu, 18 Aug 2022 21:50:44 +0800	[thread overview]
Message-ID: <20220818135044.2251342-1-zhangxiaoxu5@huawei.com> (raw)

xfstests on smb21 report kmemleak as below:

  unreferenced object 0xffff8881767d6200 (size 64):
    comm "xfs_io", pid 1284, jiffies 4294777434 (age 20.789s)
    hex dump (first 32 bytes):
      80 5a d0 11 81 88 ff ff 78 8a aa 63 81 88 ff ff  .Z......x..c....
      00 71 99 76 81 88 ff ff 00 00 00 00 00 00 00 00  .q.v............
    backtrace:
      [<00000000ad04e6ea>] cifs_close+0x92/0x2c0
      [<0000000028b93c82>] __fput+0xff/0x3f0
      [<00000000d8116851>] task_work_run+0x85/0xc0
      [<0000000027e14f9e>] do_exit+0x5e5/0x1240
      [<00000000fb492b95>] do_group_exit+0x58/0xe0
      [<00000000129a32d9>] __x64_sys_exit_group+0x28/0x30
      [<00000000e3f7d8e9>] do_syscall_64+0x35/0x80
      [<00000000102e8a0b>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

When cancel the deferred close work, we should also cleanup the struct
cifs_deferred_close.

Fixes: 9e992755be8f2 ("cifs: Call close synchronously during unlink/rename/lease break.")
Fixes: e3fc065682ebb ("cifs: Deferred close performance improvements")
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
---
 fs/cifs/misc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 1f2628ffe9d7..87f60f736731 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -737,6 +737,8 @@ cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode)
 	list_for_each_entry(cfile, &cifs_inode->openFileList, flist) {
 		if (delayed_work_pending(&cfile->deferred)) {
 			if (cancel_delayed_work(&cfile->deferred)) {
+				cifs_del_deferred_close(cfile);
+
 				tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
 				if (tmp_list == NULL)
 					break;
@@ -766,6 +768,8 @@ cifs_close_all_deferred_files(struct cifs_tcon *tcon)
 	list_for_each_entry(cfile, &tcon->openFileList, tlist) {
 		if (delayed_work_pending(&cfile->deferred)) {
 			if (cancel_delayed_work(&cfile->deferred)) {
+				cifs_del_deferred_close(cfile);
+
 				tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
 				if (tmp_list == NULL)
 					break;
@@ -799,6 +803,8 @@ cifs_close_deferred_file_under_dentry(struct cifs_tcon *tcon, const char *path)
 		if (strstr(full_path, path)) {
 			if (delayed_work_pending(&cfile->deferred)) {
 				if (cancel_delayed_work(&cfile->deferred)) {
+					cifs_del_deferred_close(cfile);
+
 					tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
 					if (tmp_list == NULL)
 						break;
-- 
2.31.1

