ksmbd: validate command request size

mainline inclusion
from mainline-v6.5-rc4
commit 5aa4fda5aa9c2a5a7bac67b4a12b089ab81fee3c
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7LU3O
CVE: CVE-2023-38432

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5aa4fda5aa9c2a5a7bac67b4a12b089ab81fee3c

--------------------------------

In commit 2b9b8f3b ("ksmbd: validate command payload size"), except
for SMB2_OPLOCK_BREAK_HE command, the request size of other commands
is not checked, it's not expected. Fix it by add check for request
size of other commands.

Cc: stable@vger.kernel.org
Fixes: 2b9b8f3b ("ksmbd: validate command payload size")
Acked-by: NNamjae Jeon <linkinjeon@kernel.org>
Signed-off-by: NLong Li <leo.lilong@huawei.com>
Signed-off-by: NSteve French <stfrench@microsoft.com>

Conflicts:
	fs/ksmbd/smb2misc.c
Signed-off-by: NLong Li <leo.lilong@huawei.com>

fs/ksmbd/smb2misc.c

@@ -379,13 +379,13 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work)
 	}
 
 	if (smb2_req_struct_sizes[command] != pdu->StructureSize2) {
-		if (command == SMB2_OPLOCK_BREAK_HE &&
-		    le16_to_cpu(pdu->StructureSize2) != OP_BREAK_STRUCT_SIZE_20 &&
-		    le16_to_cpu(pdu->StructureSize2) != OP_BREAK_STRUCT_SIZE_21) {
+		if (!(command == SMB2_OPLOCK_BREAK_HE &&
+		    (le16_to_cpu(pdu->StructureSize2) == OP_BREAK_STRUCT_SIZE_20 ||
+		    le16_to_cpu(pdu->StructureSize2) == OP_BREAK_STRUCT_SIZE_21))) {
 			/* special case for SMB2.1 lease break message */
 			ksmbd_debug(SMB,
-				    "Illegal request size %d for oplock break\n",
-				    le16_to_cpu(pdu->StructureSize2));
+				"Illegal request size %u for command %d\n",
+				le16_to_cpu(pdu->StructureSize2), command);
 			return 1;
 		}
 	}