[PATCH RFC v3 13/26] ksmbd: use scoped_with_init_fs() for share path resolution

[Christian Brauner]

Use scoped_with_init_fs() to temporarily override current->fs for
the kern_path() call in share_config_request() so the share path
lookup happens in init's filesystem context.

All ksmbd paths ← SMB command handlers ← handle_ksmbd_work() ← workqueue
← ksmbd_conn_handler_loop() ← kthread

Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
---
 fs/smb/server/mgmt/share_config.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/smb/server/mgmt/share_config.c b/fs/smb/server/mgmt/share_config.c
index 53f44ff4d376..4535566abef2 100644
--- a/fs/smb/server/mgmt/share_config.c
+++ b/fs/smb/server/mgmt/share_config.c
@@ -9,6 +9,7 @@
 #include <linux/rwsem.h>
 #include <linux/parser.h>
 #include <linux/namei.h>
+#include <linux/fs_struct.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 
@@ -189,7 +190,8 @@ static struct ksmbd_share_config *share_config_request(struct ksmbd_work *work,
 				goto out;
 			}
 
-			ret = kern_path(share->path, 0, &share->vfs_path);
+			scoped_with_init_fs()
+				ret = kern_path(share->path, 0, &share->vfs_path);
 			ksmbd_revert_fsids(work);
 			if (ret) {
 				ksmbd_debug(SMB, "failed to access '%s'\n",

-- 
2.47.3