ksmbd: fix missing error code in smb2_lock

Dan report a warning that is missing error code in smb2_lock
from static checker. This patch add error code to avoid static checker
warning.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 7f5ca471b306ff5ce582ac5d0d08dbe9c962f268..b52375ce19e904b9009165c2f1b79f0504a4962f 100644 (file)
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -6587,7 +6587,7 @@ int smb2_lock(struct ksmbd_work *work)
        int lock_count;
        int flags = 0;
        int cmd = 0;
-       int err = 0, i;
+       int err = -EIO, i, rc = 0;
        u64 lock_start, lock_length;
        struct ksmbd_lock *smb_lock = NULL, *cmp_lock, *tmp, *tmp2;
        struct ksmbd_conn *conn;
@@ -6603,7 +6603,7 @@ int smb2_lock(struct ksmbd_work *work)
        if (!fp) {
                ksmbd_debug(SMB, "Invalid file id for lock : %llu\n",
                            le64_to_cpu(req->VolatileFileId));
-               rsp->hdr.Status = STATUS_FILE_CLOSED;
+               err = -ENOENT;
                goto out2;
        }
 
@@ -6613,7 +6613,7 @@ int smb2_lock(struct ksmbd_work *work)
 
        ksmbd_debug(SMB, "lock count is %d\n", lock_count);
        if (!lock_count) {
-               rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+               err = -EINVAL;
                goto out2;
        }
 
@@ -6621,10 +6621,8 @@ int smb2_lock(struct ksmbd_work *work)
                flags = le32_to_cpu(lock_ele[i].Flags);
 
                flock = smb_flock_init(filp);
-               if (!flock) {
-                       rsp->hdr.Status = STATUS_LOCK_NOT_GRANTED;
+               if (!flock)
                        goto out;
-               }
 
                cmd = smb2_set_flock_flags(flock, flags);
 
@@ -6662,8 +6660,7 @@ int smb2_lock(struct ksmbd_work *work)
                                if (cmp_lock->fl->fl_type != F_UNLCK &&
                                    flock->fl_type != F_UNLCK) {
                                        pr_err("conflict two locks in one request\n");
-                                       rsp->hdr.Status =
-                                               STATUS_INVALID_PARAMETER;
+                                       err = -EINVAL;
                                        goto out;
                                }
                        }
@@ -6671,19 +6668,19 @@ int smb2_lock(struct ksmbd_work *work)
 
                smb_lock = smb2_lock_init(flock, cmd, flags, &lock_list);
                if (!smb_lock) {
-                       rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+                       err = -EINVAL;
                        goto out;
                }
        }
 
        list_for_each_entry_safe(smb_lock, tmp, &lock_list, llist) {
                if (smb_lock->cmd < 0) {
-                       rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+                       err = -EINVAL;
                        goto out;
                }
 
                if (!(smb_lock->flags & SMB2_LOCKFLAG_MASK)) {
-                       rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+                       err = -EINVAL;
                        goto out;
                }
 
@@ -6691,7 +6688,7 @@ int smb2_lock(struct ksmbd_work *work)
                     smb_lock->flags & SMB2_LOCKFLAG_UNLOCK) ||
                    (prior_lock == SMB2_LOCKFLAG_UNLOCK &&
                     !(smb_lock->flags & SMB2_LOCKFLAG_UNLOCK))) {
-                       rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+                       err = -EINVAL;
                        goto out;
                }
 
@@ -6744,8 +6741,7 @@ int smb2_lock(struct ksmbd_work *work)
                                        spin_unlock(&conn->llist_lock);
                                        read_unlock(&conn_list_lock);
                                        pr_err("previous lock conflict with zero byte lock range\n");
-                                       rsp->hdr.Status = STATUS_LOCK_NOT_GRANTED;
-                                               goto out;
+                                       goto out;
                                }
 
                                if (smb_lock->zero_len && !cmp_lock->zero_len &&
@@ -6754,8 +6750,7 @@ int smb2_lock(struct ksmbd_work *work)
                                        spin_unlock(&conn->llist_lock);
                                        read_unlock(&conn_list_lock);
                                        pr_err("current lock conflict with zero byte lock range\n");
-                                       rsp->hdr.Status = STATUS_LOCK_NOT_GRANTED;
-                                               goto out;
+                                       goto out;
                                }
 
                                if (((cmp_lock->start <= smb_lock->start &&
@@ -6766,8 +6761,6 @@ int smb2_lock(struct ksmbd_work *work)
                                        spin_unlock(&conn->llist_lock);
                                        read_unlock(&conn_list_lock);
                                        pr_err("Not allow lock operation on exclusive lock range\n");
-                                       rsp->hdr.Status =
-                                               STATUS_LOCK_NOT_GRANTED;
                                        goto out;
                                }
                        }
@@ -6790,19 +6783,19 @@ no_check_cl:
                flock = smb_lock->fl;
                list_del(&smb_lock->llist);
 retry:
-               err = vfs_lock_file(filp, smb_lock->cmd, flock, NULL);
+               rc = vfs_lock_file(filp, smb_lock->cmd, flock, NULL);
 skip:
                if (flags & SMB2_LOCKFLAG_UNLOCK) {
-                       if (!err) {
+                       if (!rc) {
                                ksmbd_debug(SMB, "File unlocked\n");
-                       } else if (err == -ENOENT) {
+                       } else if (rc == -ENOENT) {
                                rsp->hdr.Status = STATUS_NOT_LOCKED;
                                goto out;
                        }
                        locks_free_lock(flock);
                        kfree(smb_lock);
                } else {
-                       if (err == FILE_LOCK_DEFERRED) {
+                       if (rc == FILE_LOCK_DEFERRED) {
                                void **argv;
 
                                ksmbd_debug(SMB,
@@ -6820,12 +6813,11 @@ skip:
                                }
                                argv[0] = flock;
 
-                               err = setup_async_work(work,
-                                                      smb2_remove_blocked_lock,
-                                                      argv);
-                               if (err) {
-                                       rsp->hdr.Status =
-                                          STATUS_INSUFFICIENT_RESOURCES;
+                               rc = setup_async_work(work,
+                                                     smb2_remove_blocked_lock,
+                                                     argv);
+                               if (rc) {
+                                       err = -ENOMEM;
                                        goto out;
                                }
                                spin_lock(&fp->f_lock);
@@ -6872,7 +6864,7 @@ skip:
                                list_del(&work->fp_entry);
                                spin_unlock(&fp->f_lock);
                                goto retry;
-                       } else if (!err) {
+                       } else if (!rc) {
                                spin_lock(&work->conn->llist_lock);
                                list_add_tail(&smb_lock->clist,
                                              &work->conn->lock_list);
@@ -6882,7 +6874,6 @@ skip:
                                list_add(&smb_lock->llist, &rollback_list);
                                ksmbd_debug(SMB, "successful in taking lock\n");
                        } else {
-                               rsp->hdr.Status = STATUS_LOCK_NOT_GRANTED;
                                goto out;
                        }
                }
@@ -6908,7 +6899,6 @@ out:
 
        list_for_each_entry_safe(smb_lock, tmp, &rollback_list, llist) {
                struct file_lock *rlock = NULL;
-               int rc;
 
                rlock = smb_flock_init(filp);
                rlock->fl_type = F_UNLCK;
@@ -6931,7 +6921,19 @@ out:
                kfree(smb_lock);
        }
 out2:
-       ksmbd_debug(SMB, "failed in taking lock(flags : %x)\n", flags);
+       ksmbd_debug(SMB, "failed in taking lock(flags : %x), err : %d\n", flags, err);
+
+       if (!rsp->hdr.Status) {
+               if (err == -EINVAL)
+                       rsp->hdr.Status = STATUS_INVALID_PARAMETER;
+               else if (err == -ENOMEM)
+                       rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
+               else if (err == -ENOENT)
+                       rsp->hdr.Status = STATUS_FILE_CLOSED;
+               else
+                       rsp->hdr.Status = STATUS_LOCK_NOT_GRANTED;
+       }
+
        smb2_set_err_rsp(work);
        ksmbd_fd_put(work, fp);
        return err;