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cifs: fix check of tcon dfs in smb1

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For SMB1, the DFS flag should be checked against tcon->Flags rather
than tcon->share_flags.  While at it, add an is_tcon_dfs() helper to
check for DFS capability in a more generic way.

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Shyam Prasad N <nspmangalore@gmail.com>
This commit is contained in:
Paulo Alcantara 2020-08-27 11:20:19 -03:00 committed by Steve French
parent d012a7190f
commit e183785f25
2 changed files with 16 additions and 1 deletions
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15
fs/cifs/cifsglob.h
View File

@ -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 */

2
fs/cifs/connect.c
View File

@ -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);
}