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driver core: class: fix slab-use-after-free Read in class_register()

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Syzbot found that we had forgotten to unregister the lock_class_key when
using it in commit dcfbb67e48a2 ("driver core: class: use lock_class_key
already present in struct subsys_private") so fix that up and correctly
release it when done.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Reported-and-tested-by: <syzbot+41d665317c811d4d88aa@syzkaller.appspotmail.com>
Fixes: dcfbb67e48a2 ("driver core: class: use lock_class_key already present in struct subsys_private")
Link: https://lore.kernel.org/r/2023040126-blandness-duckling-bd55@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2023-04-01 12:09:26 +02:00
parent 980c05616e
commit f326ea63ec
1 changed files with 1 additions and 0 deletions
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drivers/base/class.c
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@ -103,6 +103,7 @@ static void class_release(struct kobject *kobj)
pr_debug("class '%s' does not have a release() function, "
"be careful\n", class->name);
lockdep_unregister_key(&cp->lock_key);
kfree(cp);
}