From: Pali Rohár pali@kernel.org
[ Upstream commit e94e882a6d69525c07589222cf3a6ff57ad12b5b ]
SMB negotiate retry functionality in cifs_negotiate() is currently broken and does not work when doing socket reconnect. Caller of this function, which is cifs_negotiate_protocol() requires that tcpStatus after successful execution of negotiate callback stay in CifsInNegotiate. But if the CIFSSMBNegotiate() called from cifs_negotiate() fails due to connection issues then tcpStatus is changed as so repeated CIFSSMBNegotiate() call does not help.
Fix this problem by moving retrying code from negotiate callback (which is either cifs_negotiate() or smb2_negotiate()) to cifs_negotiate_protocol() which is caller of those callbacks. This allows to properly handle and implement correct transistions between tcpStatus states as function cifs_negotiate_protocol() already handles it.
With this change, cifs_negotiate_protocol() now handles also -EAGAIN error set by the RFC1002_NEGATIVE_SESSION_RESPONSE processing after reconnecting with NetBIOS session.
Signed-off-by: Pali Rohár pali@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/smb/client/connect.c | 10 ++++++++++ fs/smb/client/smb1ops.c | 7 ------- fs/smb/client/smb2ops.c | 3 --- 3 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index 54aba8d642ee7..267fba234c12d 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -3946,11 +3946,13 @@ int cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses, struct TCP_Server_Info *server) { + bool in_retry = false; int rc = 0;
if (!server->ops->need_neg || !server->ops->negotiate) return -ENOSYS;
+retry: /* only send once per connect */ spin_lock(&server->srv_lock); if (server->tcpStatus != CifsGood && @@ -3970,6 +3972,14 @@ cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses, spin_unlock(&server->srv_lock);
rc = server->ops->negotiate(xid, ses, server); + if (rc == -EAGAIN) { + /* Allow one retry attempt */ + if (!in_retry) { + in_retry = true; + goto retry; + } + rc = -EHOSTDOWN; + } if (rc == 0) { spin_lock(&server->srv_lock); if (server->tcpStatus == CifsInNegotiate) diff --git a/fs/smb/client/smb1ops.c b/fs/smb/client/smb1ops.c index caa1d852ece49..280885dd6bf08 100644 --- a/fs/smb/client/smb1ops.c +++ b/fs/smb/client/smb1ops.c @@ -426,13 +426,6 @@ cifs_negotiate(const unsigned int xid, { int rc; rc = CIFSSMBNegotiate(xid, ses, server); - if (rc == -EAGAIN) { - /* retry only once on 1st time connection */ - set_credits(server, 1); - rc = CIFSSMBNegotiate(xid, ses, server); - if (rc == -EAGAIN) - rc = -EHOSTDOWN; - } return rc; }
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index b809a616728f2..cead96454bb3d 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -428,9 +428,6 @@ smb2_negotiate(const unsigned int xid, server->CurrentMid = 0; spin_unlock(&server->mid_lock); rc = SMB2_negotiate(xid, ses, server); - /* BB we probably don't need to retry with modern servers */ - if (rc == -EAGAIN) - rc = -EHOSTDOWN; return rc; }