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ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()

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If authblob->SessionKey.Length is bigger than session key
size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes.
cifs_arc4_crypt copy to session key array from SessionKey from client.

Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-21940
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2023-08-25 23:40:31 +09:00 committed by Steve French
parent 17d5b135bb
commit 4b081ce0d8
1 changed files with 3 additions and 0 deletions
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3
fs/smb/server/auth.c
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@ -355,6 +355,9 @@ int ksmbd_decode_ntlmssp_auth_blob(struct authenticate_message *authblob,
if (blob_len < (u64)sess_key_off + sess_key_len)
return -EINVAL;
if (sess_key_len > CIFS_KEY_SIZE)
return -EINVAL;
ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
if (!ctx_arc4)
return -ENOMEM;