From ca08d0eac020d48a3141dbec0a3cf64fbdb17cde Mon Sep 17 00:00:00 2001 From: Zhang Xiaoxu Date: Thu, 18 Aug 2022 21:50:44 +0800 Subject: [PATCH] cifs: Fix memory leak on the deferred close 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") Cc: stable@vger.kernel.org Reviewed-by: Shyam Prasad N Signed-off-by: Zhang Xiaoxu Signed-off-by: Steve French --- fs/cifs/misc.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 1f2628ff..87f60f7 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; -- 2.7.4