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authorLinus Torvalds <torvalds@linux-foundation.org>2020-08-30 11:38:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-30 11:38:21 -0700
commit3edd8db2d53fe6c96ad66248bb1479ae62807268 (patch)
treefe4a6cc07e64bddb5af2d0d63ae19bc303828356
parent8bb5021cc2ee5d5dd129a9f2f5ad2bb76eea297d (diff)
parente183785f2529b4135f00a0330a3b08e7c86530c8 (diff)
downloadlinux-sh-3edd8db2d53fe6c96ad66248bb1479ae62807268.tar.gz
Merge tag '5.9-rc2-smb-fix' of git://git.samba.org/sfrench/cifs-2.6
Pull cfis fix from Steve French: "DFS fix for referral problem when using SMB1" * tag '5.9-rc2-smb-fix' of git://git.samba.org/sfrench/cifs-2.6: cifs: fix check of tcon dfs in smb1
-rw-r--r--fs/cifs/cifsglob.h15
-rw-r--r--fs/cifs/connect.c2
2 files changed, 16 insertions, 1 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index b296964b8afa..b565d83ba89e 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -2031,4 +2031,19 @@ static inline bool is_smb1_server(struct TCP_Server_Info *server)
return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
}
+static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
+{
+ /*
+ * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
+ * Subsystem Notifies That a Share Is a DFS Share.
+ *
+ * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
+ * Application Updates a Share.
+ */
+ if (!tcon || !tcon->ses || !tcon->ses->server)
+ return false;
+ return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
+ tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
+}
+
#endif /* _CIFS_GLOB_H */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 51c6b7880a70..a5731dd6e656 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -4909,7 +4909,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
if (!tcon)
continue;
/* Make sure that requests go through new root servers */
- if (tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT)) {
+ if (is_tcon_dfs(tcon)) {
put_root_ses(root_ses);
set_root_ses(cifs_sb, ses, &root_ses);
}