From: Namjae Jeon <linkinjeon@kernel.org>
Date: Tue, 2 May 2023 23:38:33 +0000 (+0900)
Subject: ksmbd: fix NULL pointer dereference in smb2_get_info_filesystem()
X-Git-Tag: v6.2.15~571
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b35f6c031b87d9e51f141ff6de0ea59756a8e313;p=thirdparty%2Fkernel%2Fstable.git

ksmbd: fix NULL pointer dereference in smb2_get_info_filesystem()

commit 3ac00a2ab69b34189942afa9e862d5170cdcb018 upstream.

If share is , share->path is NULL and it cause NULL pointer
dereference issue.

Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-20479
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 61e47f66f2f2b..aef1eb1a0710b 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -4915,6 +4915,9 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
 	int rc = 0, len;
 	int fs_infoclass_size = 0;
 
+	if (!share->path)
+		return -EIO;
+
 	rc = kern_path(share->path, LOOKUP_NO_SYMLINKS, &path);
 	if (rc) {
 		pr_err("cannot create vfs path\n");