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| author | Harald Freudenberger <freude@linux.ibm.com> | 2021-04-15 12:22:03 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-11 15:47:11 +0300 |
| commit | 026499a9c2e002e621ad568d1378324ae97e5524 (patch) | |
| tree | 12b003303fc770f15e0092ad7dceaa1d0ee8dbdc /drivers/s390 | |
| parent | e534a4b139a82f91b61f8c9c084b9f681473d354 (diff) | |
| download | linux-026499a9c2e002e621ad568d1378324ae97e5524.tar.xz | |
s390/zcrypt: fix zcard and zqueue hot-unplug memleak
commit 70fac8088cfad9f3b379c9082832b4d7532c16c2 upstream.
Tests with kvm and a kmemdebug kernel showed, that on hot unplug the
zcard and zqueue structs for the unplugged card or queue are not
properly freed because of a mismatch with get/put for the embedded
kref counter.
This fix now adjusts the handling of the kref counters. With init the
kref counter starts with 1. This initial value needs to drop to zero
with the unregister of the card or queue to trigger the release and
free the object.
Fixes: 29c2680fd2bf ("s390/ap: fix ap devices reference counting")
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Cc: stable@vger.kernel.org
Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/crypto/zcrypt_card.c | 1 | ||||
| -rw-r--r-- | drivers/s390/crypto/zcrypt_queue.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_card.c b/drivers/s390/crypto/zcrypt_card.c index 33b23884b133..09fe6bb8880b 100644 --- a/drivers/s390/crypto/zcrypt_card.c +++ b/drivers/s390/crypto/zcrypt_card.c @@ -192,5 +192,6 @@ void zcrypt_card_unregister(struct zcrypt_card *zc) spin_unlock(&zcrypt_list_lock); sysfs_remove_group(&zc->card->ap_dev.device.kobj, &zcrypt_card_attr_group); + zcrypt_card_put(zc); } EXPORT_SYMBOL(zcrypt_card_unregister); diff --git a/drivers/s390/crypto/zcrypt_queue.c b/drivers/s390/crypto/zcrypt_queue.c index 5062eae73d4a..c3ffbd26b73f 100644 --- a/drivers/s390/crypto/zcrypt_queue.c +++ b/drivers/s390/crypto/zcrypt_queue.c @@ -223,5 +223,6 @@ void zcrypt_queue_unregister(struct zcrypt_queue *zq) sysfs_remove_group(&zq->queue->ap_dev.device.kobj, &zcrypt_queue_attr_group); zcrypt_card_put(zc); + zcrypt_queue_put(zq); } EXPORT_SYMBOL(zcrypt_queue_unregister); |