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fs: drop peer group ids under namespace lock

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commit cb2239c198ad9fbd5aced22cf93e45562da781eb upstream.

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 <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Brauner 2023-03-30 09:13:16 +02:00 committed by Greg Kroah-Hartman
parent 33a503b7c3
commit 0af8fae81d
1 changed files with 1 additions and 1 deletions
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2
fs/namespace.c
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@ -4121,9 +4121,9 @@ static int do_mount_setattr(struct path *path, struct mount_kattr *kattr)
unlock_mount_hash();
if (kattr->propagation) {
namespace_unlock();
if (err)
cleanup_group_ids(mnt, NULL);
namespace_unlock();
}
return err;