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authorDaniel N Pettersson <danielnp@axis.com>2018-01-11 16:00:12 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-17 13:21:12 +0100
commitf59eda16646ab3b0de9e7cac9528c40df46606ac (patch)
tree51dec04ec8ecb1d29769868dc46348ff409fb03c /fs/cifs
parentee6858f72a39226728e5085fc7388785a8ddc5d3 (diff)
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/cifs')
-rw-r--r--fs/cifs/smb2pdu.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 69b610ad3fdc..94c4c1901222 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -585,8 +585,7 @@ 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))