ksmbd: make __dir_empty() compatible with POSIX

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From: Hobin Woo <hobin.woo@xxxxxxxxxxx>

commit ca4974ca954561e79f8871d220bb08f14f64f57c upstream.

Some file systems may not provide dot (.) and dot-dot (..) as they are
optional in POSIX. ksmbd can misjudge emptiness of a directory in those
file systems, since it assumes there are always at least two entries:
dot and dot-dot.
Just don't count dot and dot-dot.

Cc: stable@xxxxxxxxxxxxxxx # v6.1+
Signed-off-by: Hobin Woo <hobin.woo@xxxxxxxxxxx>
Acked-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/smb/server/vfs.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -1115,9 +1115,10 @@ static bool __dir_empty(struct dir_conte
 	struct ksmbd_readdir_data *buf;
 
 	buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
-	buf->dirent_count++;
+	if (!is_dot_dotdot(name, namlen))
+		buf->dirent_count++;
 
-	return buf->dirent_count <= 2;
+	return !buf->dirent_count;
 }
 
 /**
@@ -1137,7 +1138,7 @@ int ksmbd_vfs_empty_dir(struct ksmbd_fil
 	readdir_data.dirent_count = 0;
 
 	err = iterate_dir(fp->filp, &readdir_data.ctx);
-	if (readdir_data.dirent_count > 2)
+	if (readdir_data.dirent_count)
 		err = -ENOTEMPTY;
 	else
 		err = 0;


Patches currently in stable-queue which might be from hobin.woo@xxxxxxxxxxx are

queue-6.11/ksmbd-make-__dir_empty-compatible-with-posix.patch




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