On Tue, May 25, 2021 at 01:53:49PM +0200, Greg KH wrote:
> On Tue, May 25, 2021 at 01:36:27PM +0200, Andrew Zaborowski wrote:
> > From: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> >
> > BUG_ON() should not be used in the kernel code, unless there are
> > exceptional reasons to do so. Replace BUG_ON() with WARN() and
> > return.
> >
> > Cc: stable@xxxxxxxxxxxxxxx
> > Fixes: b3811d36a3e7 ("KEYS: checking the input id parameters before finding asymmetric key")
> > Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> > ---
> > No changes from original submission by Jarkko.
> >
> > crypto/asymmetric_keys/asymmetric_type.c | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c
> > index ad8af3d70ac..a00bed3e04d 100644
> > --- a/crypto/asymmetric_keys/asymmetric_type.c
> > +++ b/crypto/asymmetric_keys/asymmetric_type.c
> > @@ -54,7 +54,10 @@ struct key *find_asymmetric_key(struct key *keyring,
> > char *req, *p;
> > int len;
> >
> > - BUG_ON(!id_0 && !id_1);
> > + if (!id_0 && !id_1) {
> > + WARN(1, "All ID's are NULL\n");
>
> You still just rebooted a machine (panic-on-warn is commonly set).
>
> Please just handle this properly, print an error message with dev_err()
> or pr_err() and move on, don't crash things.
>
If this case is a kernel bug (which looks to be the case here), then WARN() is
correct. The whole point of panic_on_warn is to panic the kernel when it
encounters something that has been flagged as a kernel bug, even if it would
otherwise be recoverable.
- Eric
