1 files changed, 36 insertions, 0 deletions
diff --git a/package/kernel/ksmbd/patches/10-ksmbd-check-nt_len-to-be-at-least-CIFS_ENCPWD_SIZE-i.patch b/package/kernel/ksmbd/patches/10-ksmbd-check-nt_len-to-be-at-least-CIFS_ENCPWD_SIZE-i.patch
new file mode 100644
index 0000000000..198e752106
--- /dev/null
+++ b/package/kernel/ksmbd/patches/10-ksmbd-check-nt_len-to-be-at-least-CIFS_ENCPWD_SIZE-i.patch
@@ -0,0 +1,36 @@
+From 8824b7af409f51f1316e92e9887c2fd48c0b26d6 Mon Sep 17 00:00:00 2001
+From: William Liu <will@willsroot.io>
+Date: Fri, 30 Dec 2022 09:13:35 +0900
+Subject: ksmbd: check nt_len to be at least CIFS_ENCPWD_SIZE in
+ ksmbd_decode_ntlmssp_auth_blob
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+"nt_len - CIFS_ENCPWD_SIZE" is passed directly from
+ksmbd_decode_ntlmssp_auth_blob to ksmbd_auth_ntlmv2. Malicious requests
+can set nt_len to less than CIFS_ENCPWD_SIZE, which results in a negative
+number (or large unsigned value) used for a subsequent memcpy in
+ksmbd_auth_ntlvm2 and can cause a panic.
+
+Fixes: e2f3448 ("cifsd: add server-side procedures for SMB3")
+Cc: stable@vger.kernel.org
+Signed-off-by: William Liu <will@willsroot.io>
+Signed-off-by: Hrvoje Mišetić <misetichrvoje@gmail.com>
+Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
+---
+ auth.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/auth.c
++++ b/auth.c
+@@ -583,7 +583,8 @@ int ksmbd_decode_ntlmssp_auth_blob(struc
+ 	dn_off = le32_to_cpu(authblob->DomainName.BufferOffset);
+ 	dn_len = le16_to_cpu(authblob->DomainName.Length);
+ 
+-	if (blob_len < (u64)dn_off + dn_len || blob_len < (u64)nt_off + nt_len)
++	if (blob_len < (u64)dn_off + dn_len || blob_len < (u64)nt_off + nt_len ||
++	    nt_len < CIFS_ENCPWD_SIZE)
+ 		return -EINVAL;
+ 
+ #ifdef CONFIG_SMB_INSECURE_SERVER