six ksmbd server fixes

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Merge tag '5.19-rc4-ksmbd-server-fixes' of git://git.samba.org/ksmbd

Pull ksmbd server fixes from Steve French:

 - seek null check (don't use f_seek op directly and blindly)

 - offset validation in FSCTL_SET_ZERO_DATA

 - fallocate fix (relates e.g. to xfstests generic/091 and 263)

 - two cleanup fixes

 - fix socket settings on some arch

* tag '5.19-rc4-ksmbd-server-fixes' of git://git.samba.org/ksmbd:
  ksmbd: use vfs_llseek instead of dereferencing NULL
  ksmbd: check invalid FileOffset and BeyondFinalZero in FSCTL_ZERO_DATA
  ksmbd: set the range of bytes to zero without extending file size in FSCTL_ZERO_DATA
  ksmbd: remove duplicate flag set in smb2_write
  ksmbd: smbd: Remove useless license text when SPDX-License-Identifier is already used
  ksmbd: use SOCK_NONBLOCK type for kernel_accept()

fs/ksmbd/smb2pdu.c

@@ -6490,6 +6490,7 @@ int smb2_write(struct ksmbd_work *work)
 		goto out;
 	}
 
+	ksmbd_debug(SMB, "flags %u\n", le32_to_cpu(req->Flags));
 	if (le32_to_cpu(req->Flags) & SMB2_WRITEFLAG_WRITE_THROUGH)
 		writethrough = true;
 
@@ -6505,10 +6506,6 @@ int smb2_write(struct ksmbd_work *work)
 		data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
 				    le16_to_cpu(req->DataOffset));
 
-		ksmbd_debug(SMB, "flags %u\n", le32_to_cpu(req->Flags));
-		if (le32_to_cpu(req->Flags) & SMB2_WRITEFLAG_WRITE_THROUGH)
-			writethrough = true;
-
 		ksmbd_debug(SMB, "filename %pd, offset %lld, len %zu\n",
 			    fp->filp->f_path.dentry, offset, length);
 		err = ksmbd_vfs_write(work, fp, data_buf, length, &offset,
@@ -7703,7 +7700,7 @@ int smb2_ioctl(struct ksmbd_work *work)
 	{
 		struct file_zero_data_information *zero_data;
 		struct ksmbd_file *fp;
-		loff_t off, len;
+		loff_t off, len, bfz;
 
 		if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
 			ksmbd_debug(SMB,
@@ -7720,19 +7717,26 @@ int smb2_ioctl(struct ksmbd_work *work)
 		zero_data =
 			(struct file_zero_data_information *)&req->Buffer[0];
 
-		fp = ksmbd_lookup_fd_fast(work, id);
+		off = le64_to_cpu(zero_data->FileOffset);
-		if (!fp) {
+		bfz = le64_to_cpu(zero_data->BeyondFinalZero);
-			ret = -ENOENT;
+		if (off > bfz) {
+			ret = -EINVAL;
 			goto out;
 		}
 
-		off = le64_to_cpu(zero_data->FileOffset);
+		len = bfz - off;
-		len = le64_to_cpu(zero_data->BeyondFinalZero) - off;
+		if (len) {
+			fp = ksmbd_lookup_fd_fast(work, id);
+			if (!fp) {
+				ret = -ENOENT;
+				goto out;
+			}
 
-		ret = ksmbd_vfs_zero_data(work, fp, off, len);
+			ret = ksmbd_vfs_zero_data(work, fp, off, len);
-		ksmbd_fd_put(work, fp);
+			ksmbd_fd_put(work, fp);
-		if (ret < 0)
+			if (ret < 0)
-			goto out;
+				goto out;
+		}
 		break;
 	}
 	case FSCTL_QUERY_ALLOCATED_RANGES:

fs/ksmbd/transport_rdma.c

@@ -5,16 +5,6 @@
  *
  *   Author(s): Long Li <longli@microsoft.com>,
  *		Hyunchul Lee <hyc.lee@gmail.com>
- *
- *   This program is free software;  you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
- *   the GNU General Public License for more details.
  */
 
 #define SUBMOD_NAME	"smb_direct"

fs/ksmbd/transport_tcp.c

@@ -230,7 +230,7 @@ static int ksmbd_kthread_fn(void *p)
 			break;
 		}
 		ret = kernel_accept(iface->ksmbd_socket, &client_sk,
-				    O_NONBLOCK);
+				    SOCK_NONBLOCK);
 		mutex_unlock(&iface->sock_release_lock);
 		if (ret) {
 			if (ret == -EAGAIN)

fs/ksmbd/vfs.c

@@ -1015,7 +1015,9 @@ int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
 				     FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
 				     off, len);
 
-	return vfs_fallocate(fp->filp, FALLOC_FL_ZERO_RANGE, off, len);
+	return vfs_fallocate(fp->filp,
+			     FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
+			     off, len);
 }
 
 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
@@ -1046,7 +1048,7 @@ int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
 	*out_count = 0;
 	end = start + length;
 	while (start < end && *out_count < in_count) {
-		extent_start = f->f_op->llseek(f, start, SEEK_DATA);
+		extent_start = vfs_llseek(f, start, SEEK_DATA);
 		if (extent_start < 0) {
 			if (extent_start != -ENXIO)
 				ret = (int)extent_start;
@@ -1056,7 +1058,7 @@ int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
 		if (extent_start >= end)
 			break;
 
-		extent_end = f->f_op->llseek(f, extent_start, SEEK_HOLE);
+		extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
 		if (extent_end < 0) {
 			if (extent_end != -ENXIO)
 				ret = (int)extent_end;