From: Namjae Jeon <linkinjeon@kernel.org>
Date: Sat, 18 Sep 2021 09:45:12 +0000 (+0900)
Subject: ksmbd: add validation for FILE_FULL_EA_INFORMATION of smb2_get_info
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=6d56262c3d224699b29b9bb6b4ace8bab7d692c2;p=uclinux-h8%2Flinux.git

ksmbd: add validation for FILE_FULL_EA_INFORMATION of smb2_get_info

Add validation to check whether req->InputBufferLength is smaller than
smb2_ea_info_req structure size.

Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Steve French <smfrench@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 46e0275a77a8..6304c9bda479 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -4045,6 +4045,10 @@ static int smb2_get_ea(struct ksmbd_work *work, struct ksmbd_file *fp,
 	path = &fp->filp->f_path;
 	/* single EA entry is requested with given user.* name */
 	if (req->InputBufferLength) {
+		if (le32_to_cpu(req->InputBufferLength) <
+		    sizeof(struct smb2_ea_info_req))
+			return -EINVAL;
+
 		ea_req = (struct smb2_ea_info_req *)req->Buffer;
 	} else {
 		/* need to send all EAs, if no specific EA is requested*/