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linux/fs/cifs
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Sachin Prabhu 62a6cfddcc cifs: Do not send echoes before Negotiate is complete 
commit 4fcd1813e6 ("Fix reconnect to not defer smb3 session reconnect
long after socket reconnect") added support for Negotiate requests to
be initiated by echo calls.

To avoid delays in calling echo after a reconnect, I added the patch
introduced by the commit b8c600120f ("Call echo service immediately
after socket reconnect").

This has however caused a regression with cifs shares which do not have
support for echo calls to trigger Negotiate requests. On connections
which need to call Negotiation, the echo calls trigger an error which
triggers a reconnect which in turn triggers another echo call. This
results in a loop which is only broken when an operation is performed on
the cifs share. For an idle share, it can DOS a server.

The patch uses the smb_operation can_echo() for cifs so that it is
called only if connection has been already been setup.

kernel bz: 194531

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Tested-by: Jonathan Liu <net147@gmail.com>
Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <smfrench@gmail.com>
2017-04-17 15:44:23 -05:00
..
asn1.c [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
cache.c [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
cifs_debug.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
cifs_debug.h lib: update single-char callers of strtobool() 2016-03-17 15:09:34 -07:00
cifs_dfs_ref.c CIFS: add build_path_from_dentry_optional_prefix() 2017-03-01 22:26:10 -06:00
cifs_fs_sb.h CIFS: Add new mount option to set owner uid and gid from special sids in acl 2016-10-14 14:22:01 -05:00
cifs_ioctl.h Enable previous version support 2016-10-13 19:48:11 -05:00
cifs_spnego.c cifs: Create dedicated keyring for spnego operations 2016-05-19 21:56:30 -05:00
cifs_spnego.h [CIFS] Rename three structures to avoid camel case 2011-05-27 04:34:02 +00:00
cifs_unicode.c File names with trailing period or space need special case conversion 2016-06-24 12:05:52 -05:00
cifs_unicode.h CIFS: Fix sparse warnings 2017-03-02 23:11:54 -06:00
cifs_uniupr.h
cifsacl.c CIFS: Retrieve uid and gid from special sid if enabled 2016-10-14 14:22:16 -05:00
cifsacl.h cifs: fix SID binary to string conversion 2012-12-11 11:48:49 -06:00
cifsencrypt.c CIFS: Encrypt SMB3 requests before sending 2017-02-01 16:46:36 -06:00
cifsfs.c Introduce cifs_copy_file_range() 2017-04-07 08:04:41 -05:00
cifsfs.h Introduce cifs_copy_file_range() 2017-04-07 08:04:41 -05:00
cifsglob.h CIFS: remove bad_network_name flag 2017-04-10 23:36:39 -05:00
cifspdu.h CIFS: move DFS response parsing out of SMB1 code 2017-03-01 22:26:10 -06:00
cifsproto.h CIFS: Fix null pointer deref during read resp processing 2017-04-10 23:36:38 -05:00
cifssmb.c CIFS: Fix null pointer deref during read resp processing 2017-04-10 23:36:38 -05:00
connect.c CIFS: handle guest access errors to Windows shares 2017-04-10 23:36:38 -05:00
dir.c CIFS: add build_path_from_dentry_optional_prefix() 2017-03-01 22:26:10 -06:00
dns_resolve.c cifs: fix composing of mount options for DFS referrals 2013-05-24 13:08:31 -05:00
dns_resolve.h
export.c [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
file.c CIFS: store results of cifs_reopen_file to avoid infinite wait 2017-04-10 23:36:39 -05:00
fscache.c NFS client updates for Linux 3.13 2013-11-08 05:57:46 +09:00
fscache.h CIFS: FS-Cache: Uncache unread pages in cifs_readpages() before freeing them 2013-09-18 10:17:03 -05:00
inode.c Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-03-03 11:38:56 -08:00
ioctl.c Introduce cifs_copy_file_range() 2017-04-07 08:04:41 -05:00
Kconfig CIFS: Encrypt SMB3 requests before sending 2017-02-01 16:46:36 -06:00
link.c cifs: use %16phN for formatting md5 sum 2016-12-15 00:21:37 -06:00
Makefile cifs: Switch to generic xattr handlers 2016-04-23 15:33:03 -04:00
misc.c CIFS: move DFS response parsing out of SMB1 code 2017-03-01 22:26:10 -06:00
netmisc.c Fix signed/unsigned pointer warning 2014-12-14 14:55:57 -06:00
nterr.c CIFS: Rename 7 error codes to NT_ style 2012-07-24 10:25:10 -05:00
nterr.h CIFS: Rename 7 error codes to NT_ style 2012-07-24 10:25:10 -05:00
ntlmssp.h cifs: dynamic allocation of ntlmssp blob 2016-06-23 23:45:07 -05:00
readdir.c cifs: initialize file_info_lock 2017-01-14 14:58:29 -06:00
rfc1002pdu.h
sess.c smb2: Enforce sec= mount option 2017-03-02 23:13:37 -06:00
smb1ops.c cifs: Do not send echoes before Negotiate is complete 2017-04-17 15:44:23 -05:00
smb2file.c CIFS: add use_ipc flag to SMB2_ioctl() 2017-03-01 22:26:11 -06:00
smb2glob.h CIFS: Separate SMB2 header structure 2017-02-01 16:46:34 -06:00
smb2inode.c Do not send SMB3 SET_INFO request if nothing is changing 2016-10-13 19:46:51 -05:00
smb2maperror.c CIFS: Separate SMB2 header structure 2017-02-01 16:46:34 -06:00
smb2misc.c Handle mismatched open calls 2017-04-07 08:04:40 -05:00
smb2ops.c CIFS: Fix null pointer deref during read resp processing 2017-04-10 23:36:38 -05:00
smb2pdu.c CIFS: Fix SMB3 mount without specifying a security mechanism 2017-04-13 10:03:26 -05:00
smb2pdu.h CIFS: implement get_dfs_refer for SMB2+ 2017-03-02 17:05:31 -06:00
smb2proto.h Handle mismatched open calls 2017-04-07 08:04:40 -05:00
smb2status.h CIFS: Add SMB2 status codes 2012-07-24 10:25:13 -05:00
smb2transport.c Handle mismatched open calls 2017-04-07 08:04:40 -05:00
smbencrypt.c cifs: Fix smbencrypt() to stop pointing a scatterlist at the stack 2016-12-14 01:44:16 -06:00
smberr.h
smbfsctl.h [SMB3] Send durable handle v2 contexts when use of persistent handles required 2015-11-03 09:26:27 -06:00
transport.c Handle mismatched open calls 2017-04-07 08:04:40 -05:00
winucase.c [CIFS] quiet sparse compile warning 2013-09-08 14:54:24 -05:00
xattr.c Add way to query creation time of file via cifs xattr 2016-10-12 12:08:31 -05:00