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| author | Daniel N Pettersson <danielnp@axis.com> | 2018-01-11 16:00:12 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-16 20:14:42 +0100 |
| commit | 833692a735399fc52942efc1ba3e46fd6d026f72 (patch) | |
| tree | f0cc1ea163e4f405f1d6ef7790c7361b79313884 /fs | |
| parent | 23dd6b8717fb32fd68be8ab6cd76743e298e4100 (diff) | |
| download | linux-stable-833692a735399fc52942efc1ba3e46fd6d026f72.tar.gz linux-stable-833692a735399fc52942efc1ba3e46fd6d026f72.tar.bz2 linux-stable-833692a735399fc52942efc1ba3e46fd6d026f72.zip | |
cifs: Fix autonegotiate security settings mismatch
commit 9aca7e454415f7878b28524e76bebe1170911a88 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -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 fc5809d494ed..c147cc58056f 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -507,8 +507,7 @@ 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)) |