On Tue, Nov 28, 2017 at 10:13:01AM +0000, David Howells wrote:
> Eric Biggers <[email protected]> wrote:
> 
> > +           if (do_perm_check) {
> > +                   ret = key_permission(make_key_ref(dest_keyring, 1),
> > +                                        KEY_NEED_WRITE);
> 
> dest_keyring may be NULL at this point as alloc_uid() doesn't automatically
> create keyrings.
> 
> David

Argh, you're right.  I must have been confused by the calls to key_serial(),
key_put(), etc., but those all check for NULL.  I'll send a revised patch.

Eric

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