From cb2239c198ad9fbd5aced22cf93e45562da781eb Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Thu, 30 Mar 2023 09:13:16 +0200 Subject: [PATCH] fs: drop peer group ids under namespace lock When cleaning up peer group ids in the failure path we need to make sure to hold on to the namespace lock. Otherwise another thread might just turn the mount from a shared into a non-shared mount concurrently. Link: https://lore.kernel.org/lkml/00000000000088694505f8132d77@google.com Fixes: 2a1867219c7b ("fs: add mount_setattr()") Reported-by: syzbot+8ac3859139c685c4f597@syzkaller.appspotmail.com Cc: stable@vger.kernel.org # 5.12+ Message-Id: <20230330-vfs-mount_setattr-propagation-fix-v1-1-37548d91533b@kernel.org> Signed-off-by: Christian Brauner --- fs/namespace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/namespace.c b/fs/namespace.c index bc0f152..6836e93 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -4183,9 +4183,9 @@ out: unlock_mount_hash(); if (kattr->propagation) { - namespace_unlock(); if (err) cleanup_group_ids(mnt, NULL); + namespace_unlock(); } return err; -- 2.7.4