On Wed, Oct 16, 2019 at 07:48:14PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@xxxxxxxxxx>
>
> After do_add_mount() returns success, the caller doesn't hold a
> reference to the 'struct mount' anymore. So it's invalid to access it
> in mnt_warn_timestamp_expiry().
>
> Fix it by calling mnt_warn_timestamp_expiry() before do_add_mount()
> rather than after, and adjusting the warning message accordingly.
>
> Reported-by: syzbot+da4f525235510683d855@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: f8b92ba67c5d ("mount: Add mount warning for impending timestamp expiry")
> Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Applied to #fixes and pushed
