ksmbd: ignore trailing slashes in share paths

Trailing slashes in share paths (like: /home/me/Share/) caused permission
issues with shares for clients on iOS and on Android TV for me,
but otherwise they work fine with plain old Samba.

Cc: stable@vger.kernel.org
Signed-off-by: Nandor Kracser <bonifaido@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: bonifaido

fs/smb/server/mgmt/share_config.c

@@ -165,8 +165,12 @@ static struct ksmbd_share_config *share_config_request(struct unicode_map *um,
 
 		share->path = kstrndup(ksmbd_share_config_path(resp), path_len,
 				      GFP_KERNEL);
-		if (share->path)
+		if (share->path) {
 			share->path_sz = strlen(share->path);
+			while (share->path_sz > 1 &&
+			       share->path[share->path_sz - 1] == '/')
+				share->path[--share->path_sz] = '\0';
+		}
 		share->create_mask = resp->create_mask;
 		share->directory_mask = resp->directory_mask;
 		share->force_create_mode = resp->force_create_mode;