diff options
| author | Daniel N Pettersson <danielnp@axis.com> | 2018-01-11 18:00:12 +0300 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2018-01-25 04:49:07 +0300 |
| commit | 9aca7e454415f7878b28524e76bebe1170911a88 (patch) | |
| tree | 7244ce43905ce4dc6aaa2608a659e31c08705b46 /fs/cifs | |
| parent | 9084432c316b76f697732ac806f706a5a436aae1 (diff) | |
| download | linux-9aca7e454415f7878b28524e76bebe1170911a88.tar.xz | |
cifs: Fix autonegotiate security settings mismatch
Autonegotiation gives a security settings mismatch error if the SMB
server selects an SMBv3 dialect that isn't SMB3.02. The exact error is
"protocol revalidation - security settings mismatch".
This can be tested using Samba v4.2 or by setting the global Samba
setting max protocol = SMB3_00.
The check that fails in smb3_validate_negotiate is the dialect
verification of the negotiate info response. This is because it tries
to verify against the protocol_id in the global smbdefault_values. The
protocol_id in smbdefault_values is SMB3.02.
In SMB2_negotiate the protocol_id in smbdefault_values isn't updated,
it is global so it probably shouldn't be, but server->dialect is.
This patch changes the check in smb3_validate_negotiate to use
server->dialect instead of server->vals->protocol_id. The patch works
with autonegotiate and when using a specific version in the vers mount
option.
Signed-off-by: Daniel N Pettersson <danielnp@axis.com>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index a3e67beb73e2..7900aec7f92f 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -700,8 +700,7 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) } /* check validate negotiate info response matches what we got earlier */ - if (pneg_rsp->Dialect != - cpu_to_le16(tcon->ses->server->vals->protocol_id)) + if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect)) goto vneg_out; if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode)) |