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 into a from a shared into a non-shared mount
concurrently.
Reported-by: syzbot+8ac3859139c685c4f597@syzkaller.appspotmail.com
Link: https://lore.kernel.org/lkml/00000000000088694505f8132d77@google.com
Fixes: 2a1867219c7b ("fs: add mount_setattr()")
Cc: stable@vger.kernel.org # 5.12+
Signed-off-by: Christian Brauner <brauner@kernel.org>
1 file changed
