4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Steve French <stfrench@xxxxxxxxxxxxx>
[ Upstream commit 8505c8bfd85a260c9dc5c47e15bd8c5357fcbcd2 ]
If user specifies "posix" on an SMB3.11 mount, then fail the mount
if server does not return the POSIX negotiate context indicating
support for posix.
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Reviewed-by: Aurelien Aptel <aaptel@xxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/connect.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3031,11 +3031,15 @@ cifs_get_tcon(struct cifs_ses *ses, stru
}
#ifdef CONFIG_CIFS_SMB311
- if ((volume_info->linux_ext) && (ses->server->posix_ext_supported)) {
- if (ses->server->vals->protocol_id == SMB311_PROT_ID) {
+ if (volume_info->linux_ext) {
+ if (ses->server->posix_ext_supported) {
tcon->posix_extensions = true;
printk_once(KERN_WARNING
"SMB3.11 POSIX Extensions are experimental\n");
+ } else {
+ cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions.\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
}
}
#endif /* 311 */
