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ksmbd: fix possible memory leak in smb2_lock() 

commit d3ca9f7aeb upstream.

argv needs to be free when setup_async_work fails or when the current
process is woken up.

Fixes: e2f34481b2 ("cifsd: add server-side procedures for SMB3")
Cc: stable@vger.kernel.org
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hangyu Hua 2023-02-17 22:29:34 +09:00 committed by Greg Kroah-Hartman
parent 237f4b7159
commit 11d38f8a0c
2 changed files with 15 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
fs/ksmbd/smb2pdu.c
View File

@ -6644,7 +6644,7 @@ int smb2_cancel(struct ksmbd_work *work)
struct ksmbd_conn *conn = work->conn;
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
struct smb2_hdr *chdr;
struct ksmbd_work *cancel_work = NULL, *iter;
struct ksmbd_work *iter;
struct list_head *command_list;
ksmbd_debug(SMB, "smb2 cancel called on mid %llu, async flags 0x%x\n",
@ -6666,7 +6666,9 @@ int smb2_cancel(struct ksmbd_work *work)
"smb2 with AsyncId %llu cancelled command = 0x%x\n",
le64_to_cpu(hdr->Id.AsyncId),
le16_to_cpu(chdr->Command));
cancel_work = iter;
iter->state = KSMBD_WORK_CANCELLED;
if (iter->cancel_fn)
iter->cancel_fn(iter->cancel_argv);
break;
}
spin_unlock(&conn->request_lock);
@ -6685,18 +6687,12 @@ int smb2_cancel(struct ksmbd_work *work)
"smb2 with mid %llu cancelled command = 0x%x\n",
le64_to_cpu(hdr->MessageId),
le16_to_cpu(chdr->Command));
cancel_work = iter;
iter->state = KSMBD_WORK_CANCELLED;
break;
}
spin_unlock(&conn->request_lock);
}
if (cancel_work) {
cancel_work->state = KSMBD_WORK_CANCELLED;
if (cancel_work->cancel_fn)
cancel_work->cancel_fn(cancel_work->cancel_argv);
}
/* For SMB2_CANCEL command itself send no response*/
work->send_no_response = 1;
return 0;
@ -7061,6 +7057,14 @@ skip:
ksmbd_vfs_posix_lock_wait(flock);
spin_lock(&work->conn->request_lock);
spin_lock(&fp->f_lock);
list_del(&work->fp_entry);
work->cancel_fn = NULL;
kfree(argv);
spin_unlock(&fp->f_lock);
spin_unlock(&work->conn->request_lock);
if (work->state != KSMBD_WORK_ACTIVE) {
list_del(&smb_lock->llist);
spin_lock(&work->conn->llist_lock);
@ -7069,9 +7073,6 @@ skip:
locks_free_lock(flock);
if (work->state == KSMBD_WORK_CANCELLED) {
spin_lock(&fp->f_lock);
list_del(&work->fp_entry);
spin_unlock(&fp->f_lock);
rsp->hdr.Status =
STATUS_CANCELLED;
kfree(smb_lock);
@ -7093,9 +7094,6 @@ skip:
list_del(&smb_lock->clist);
spin_unlock(&work->conn->llist_lock);
spin_lock(&fp->f_lock);
list_del(&work->fp_entry);
spin_unlock(&fp->f_lock);
goto retry;
} else if (!rc) {
spin_lock(&work->conn->llist_lock);

5
fs/ksmbd/vfs_cache.c
View File

@ -364,12 +364,11 @@ static void __put_fd_final(struct ksmbd_work *work, struct ksmbd_file *fp)
static void set_close_state_blocked_works(struct ksmbd_file *fp)
{
struct ksmbd_work *cancel_work, *ctmp;
struct ksmbd_work *cancel_work;
spin_lock(&fp->f_lock);
list_for_each_entry_safe(cancel_work, ctmp, &fp->blocked_works,
list_for_each_entry(cancel_work, &fp->blocked_works,
fp_entry) {
list_del(&cancel_work->fp_entry);
cancel_work->state = KSMBD_WORK_CLOSED;
cancel_work->cancel_fn(cancel_work->cancel_argv);
}