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linux/fs/cifs
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Paulo Alcantara 9fb0db4051 cifs: fix potential deadlock in cache_refresh_path() 
Avoid getting DFS referral from an exclusive lock in
cache_refresh_path() because the tcon IPC used for getting the
referral could be disconnected and thus causing a deadlock as shown
below:

task A                       task B
======                       ======
cifs_demultiplex_thread()    dfs_cache_find()
 cifs_handle_standard()       cache_refresh_path()
  reconnect_dfs_server()       down_write()
   dfs_cache_noreq_find()       get_dfs_referral()
    down_read() <- deadlock      smb2_get_dfs_refer()
                                  SMB2_ioctl()
				   cifs_send_recv()
				    compound_send_recv()
				     wait_for_response()

where task A cannot wake up task B because it is blocked on
down_read() due to the exclusive lock held in cache_refresh_path() and
therefore not being able to make progress.

Fixes: c9f711039905 ("cifs: keep referral server sessions alive")
Reviewed-by: Aurélien Aptel <aurelien.aptel@gmail.com>
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
2023-01-18 10:45:40 -06:00
..
asn1.c
cifs: decoding negTokenInit with generic ASN1 decoder
2021-06-20 21:28:17 -05:00
cached_dir.c
cifs: drop the lease for cached directories on rmdir or rename
2022-10-19 17:57:41 -05:00
cached_dir.h
cifs: drop the lease for cached directories on rmdir or rename
2022-10-19 17:57:41 -05:00
cifs_debug.c
cifs: share dfs connections and supers
2022-12-19 08:03:12 -06:00
cifs_debug.h
smb3: add dynamic trace points for tree disconnect
2022-10-05 01:31:18 -05:00
cifs_dfs_ref.c
cifs: use origin fullpath for automounts
2022-12-19 08:03:12 -06:00
cifs_fs_sb.h
cifs: support nested dfs links over reconnect
2021-11-10 16:30:13 -06:00
cifs_ioctl.h
cifs: minor cleanup of some headers
2022-12-12 13:08:06 -06:00
cifs_spnego_negtokeninit.asn1
cifs: decoding negTokenInit with generic ASN1 decoder
2021-06-20 21:28:17 -05:00
cifs_spnego.c
cred: Do not default to init_cred in prepare_kernel_cred()
2022-11-01 10:04:52 -07:00
cifs_spnego.h
cifs: use the chans_need_reconnect bitmap for reconnect status
2022-01-02 20:38:46 -06:00
cifs_swn.c
smb3: add dynamic trace points for tree disconnect
2022-10-05 01:31:18 -05:00
cifs_swn.h
cifs: simplify SWN code with dummy funcs instead of ifdefs
2021-04-25 16:28:22 -05:00
cifs_unicode.c
cifs: remove pathname for file from SPDX header
2021-09-13 14:51:10 -05:00
cifs_unicode.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
cifs_uniupr.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
cifsacl.c
hardening updates for v6.2-rc1
2022-12-14 12:20:00 -08:00
cifsacl.h
cifs: remove pathname for file from SPDX header
2021-09-13 14:51:10 -05:00
cifsencrypt.c
cifs: fix potential memory leaks in session setup
2023-01-10 23:24:37 -06:00
cifsfs.c
cifs: get rid of mount options string parsing
2022-12-19 08:03:11 -06:00
cifsfs.h
cifs: update internal module number
2022-12-19 08:04:50 -06:00
cifsglob.h
cifs: fix refresh of cached referrals
2022-12-19 08:03:12 -06:00
cifspdu.h
cifs: fix various whitespace errors in headers
2022-12-12 13:08:22 -06:00
cifsproto.h
cifs: use origin fullpath for automounts
2022-12-19 08:03:12 -06:00
cifsroot.c
cifs: move from strlcpy with unused retval to strscpy
2022-08-19 11:02:26 -05:00
cifssmb.c
cifs: use stub posix acl handlers
2022-10-20 10:13:32 +02:00
connect.c
cifs: do not query ifaces on smb1 mounts
2023-01-10 23:24:14 -06:00
dfs_cache.c
cifs: fix potential deadlock in cache_refresh_path()
2023-01-18 10:45:40 -06:00
dfs_cache.h
cifs: don't block in dfs_cache_noreq_update_tgthint()
2022-12-19 08:03:12 -06:00
dfs.c
cifs: protect access of TCP_Server_Info::{dstaddr,hostname}
2023-01-04 09:06:53 -06:00
dfs.h
cifs: use origin fullpath for automounts
2022-12-19 08:03:12 -06:00
dir.c
cifs: use origin fullpath for automounts
2022-12-19 08:03:12 -06:00
dns_resolve.c
cifs: set resolved ip in sockaddr
2022-12-19 08:03:11 -06:00
dns_resolve.h
cifs: set resolved ip in sockaddr
2022-12-19 08:03:11 -06:00
export.c
cifs: remove pathname for file from SPDX header
2021-09-13 14:51:10 -05:00
file.c
13 cifs/smb3 client fixes
2022-12-15 14:53:14 -08:00
fs_context.c
cifs: share dfs connections and supers
2022-12-19 08:03:12 -06:00
fs_context.h
cifs: share dfs connections and supers
2022-12-19 08:03:12 -06:00
fscache.c
use less confusing names for iov_iter direction initializers
2022-11-25 13:01:55 -05:00
fscache.h
cifs: Remove {cifs,nfs}_fscache_release_page()
2022-08-10 21:26:08 -05:00
inode.c
cifs: reduce roundtrips on create/qinfo requests
2022-12-19 08:03:11 -06:00
ioctl.c
cifs: Fix wrong return value checking when GETFLAGS
2022-11-16 00:21:04 -06:00
Kconfig
cifs: Support fscache indexing rewrite
2022-01-19 11:21:08 -06:00
link.c
cifs: Fix uninitialized memory read for smb311 posix symlink create
2023-01-12 09:51:48 -06:00
Makefile
cifs: get rid of mount options string parsing
2022-12-19 08:03:11 -06:00
misc.c
cifs: protect access of TCP_Server_Info::{dstaddr,hostname}
2023-01-04 09:06:53 -06:00
netlink.c
genetlink: start to validate reserved header bytes
2022-08-29 12:47:15 +01:00
netlink.h
cifs: Register generic netlink family
2020-12-14 09:16:22 -06:00
netmisc.c
cifs: remove unused server parameter from calc_smb_size()
2022-08-17 18:07:13 -05:00
nterr.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61
2019-05-24 17:36:45 +02:00
nterr.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61
2019-05-24 17:36:45 +02:00
ntlmssp.h
treewide: Replace zero-length arrays with flexible-array members
2022-02-17 07:00:39 -06:00
readdir.c
cifs: improve symlink handling for smb2+
2022-10-13 09:36:04 -05:00
rfc1002pdu.h
cifs: remove pathname for file from SPDX header
2021-09-13 14:51:10 -05:00
sess.c
cifs: fix potential memory leaks in session setup
2023-01-10 23:24:37 -06:00
smb1ops.c
cifs: fix file info setting in cifs_open_file()
2023-01-09 13:47:02 -06:00
smb2file.c
cifs: don't leak -ENOMEM in smb2_open_file()
2022-12-19 08:04:41 -06:00
smb2glob.h
smb3: move defines for ioctl protocol header and SMB2 sizes to smbfs_common
2022-03-26 23:09:20 -05:00
smb2inode.c
cifs: reduce roundtrips on create/qinfo requests
2022-12-19 08:03:11 -06:00
smb2maperror.c
cifs: Create a new shared file holding smb2 pdu definitions
2021-11-05 09:50:57 -05:00
smb2misc.c
cifs: avoid unnecessary iteration of tcp sessions
2022-11-04 23:34:40 -05:00
smb2ops.c
cifs: fix interface count calculation during refresh
2023-01-04 23:18:07 -06:00
smb2pdu.c
cifs: fix potential memory leaks in session setup
2023-01-10 23:24:37 -06:00
smb2pdu.h
cifs: improve symlink handling for smb2+
2022-10-13 09:36:04 -05:00
smb2proto.h
cifs: Parse owner/group for stat in smb311 posix extensions
2022-12-08 09:51:53 -06:00
smb2status.h
cifs: remove pathname for file from SPDX header
2021-09-13 14:51:10 -05:00
smb2transport.c
cifs: avoid unnecessary iteration of tcp sessions
2022-11-04 23:34:40 -05:00
smbdirect.c
Fix formatting of client smbdirect RDMA logging
2022-10-05 01:31:04 -05:00
smbdirect.h
Decrease the number of SMB3 smbdirect client SGEs
2022-10-05 01:29:21 -05:00
smbencrypt.c
cifs: rename cifs_common to smbfs_common
2021-09-08 23:59:26 -05:00
smberr.h
cifs: remove pathname for file from SPDX header
2021-09-13 14:51:10 -05:00
trace.c
smb3: Cleanup license mess
2019-01-24 09:37:33 -06:00
trace.h
smb3: add dynamic trace points for tree disconnect
2022-10-05 01:31:18 -05:00
transport.c
use less confusing names for iov_iter direction initializers
2022-11-25 13:01:55 -05:00
unc.c
cifs: don't cargo-cult strndup()
2021-04-25 16:28:23 -05:00
winucase.c
cifs: remove pathname for file from SPDX header
2021-09-13 14:51:10 -05:00
xattr.c
cifs: use stub posix acl handlers
2022-10-20 10:13:32 +02:00