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. Reported-by: zdi-disclosures@xxxxxxxxxxxxxx # ZDI-CAN-21940 Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx> --- fs/smb/server/auth.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/smb/server/auth.c b/fs/smb/server/auth.c index af7b2cdba126..229a6527870d 100644 --- a/fs/smb/server/auth.c +++ b/fs/smb/server/auth.c @@ -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; -- 2.25.1
