From: Christian Brauner <brauner@kernel.org>
Date: Fri, 22 Sep 2023 11:49:05 +0000 (+0200)
Subject: fsconfig: ensure that dirfd is set to aux
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9cf16b380af5bab7d0952b9aad0601ebf986de69;p=linux.git

fsconfig: ensure that dirfd is set to aux

The code in fs_param_is_fd() expects param->dirfd to be set to the fd
that was used to set param->file to initialize result->uint_32. So make
sure it's set so users like autofs using FSCONFIG_SET_FD with the new
mount api can rely on this to be set to the correct value.

Link: https://lore.kernel.org/lkml/20230922-vorbringen-spaghetti-946729122076@brauner
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/fs/fsopen.c b/fs/fsopen.c
index ce03f6521c887..6593ae5181155 100644
--- a/fs/fsopen.c
+++ b/fs/fsopen.c
@@ -465,6 +465,7 @@ SYSCALL_DEFINE5(fsconfig,
 		param.file = fget(aux);
 		if (!param.file)
 			goto out_key;
+		param.dirfd = aux;
 		break;
 	default:
 		break;