diff options
| author | Paulo Alcantara <pc@manguebit.com> | 2023-04-26 13:43:53 -0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2023-05-03 23:29:39 -0500 |
| commit | 3dc9c433c9dde15477d02b609ccb4328e2adb6dc (patch) | |
| tree | d097b78d406ba5b6324c3e732ce8aebfc6aa4440 /fs/cifs/cifsglob.h | |
| parent | ee20d7c6100752eaf2409d783f4f1449c29ea33d (diff) | |
cifs: protect access of TCP_Server_Info::{origin,leaf}_fullpath
Protect access of TCP_Server_Info::{origin,leaf}_fullpath when
matching DFS connections, and get rid of
TCP_Server_Info::current_fullpath while we're at it.
Cc: stable@vger.kernel.org # v6.2+
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/cifsglob.h')
| -rw-r--r-- | fs/cifs/cifsglob.h | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 08a73dcb7786..a62447404851 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -736,17 +736,23 @@ struct TCP_Server_Info { #endif struct mutex refpath_lock; /* protects leaf_fullpath */ /* - * Canonical DFS full paths that were used to chase referrals in mount and reconnect. + * origin_fullpath: Canonical copy of smb3_fs_context::source. + * It is used for matching existing DFS tcons. * - * origin_fullpath: first or original referral path - * leaf_fullpath: last referral path (might be changed due to nested links in reconnect) + * leaf_fullpath: Canonical DFS referral path related to this + * connection. + * It is used in DFS cache refresher, reconnect and may + * change due to nested DFS links. * - * current_fullpath: pointer to either origin_fullpath or leaf_fullpath - * NOTE: cannot be accessed outside cifs_reconnect() and smb2_reconnect() + * Both protected by @refpath_lock and @srv_lock. The @refpath_lock is + * mosly used for not requiring a copy of @leaf_fullpath when getting + * cached or new DFS referrals (which might also sleep during I/O). + * While @srv_lock is held for making string and NULL comparions against + * both fields as in mount(2) and cache refresh. * - * format: \\HOST\SHARE\[OPTIONAL PATH] + * format: \\HOST\SHARE[\OPTIONAL PATH] */ - char *origin_fullpath, *leaf_fullpath, *current_fullpath; + char *origin_fullpath, *leaf_fullpath; }; static inline bool is_smb1(struct TCP_Server_Info *server) |