From: Lars Ellenberg Date: Tue, 14 Sep 2010 18:40:41 +0000 (+0200) Subject: drbd: fix unlikely access after free and list corruption X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=22cc37a943832c948808884604ec6f5ff2594c1d;p=openwrt%2Fstaging%2Fblogic.git drbd: fix unlikely access after free and list corruption Various cleanup paths have been incomplete, for the very unlikely case that we cannot allocate enough bios from process context when submitting on behalf of the peer or resync process. Never observed. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 990fe01afa50..71775a9de21d 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -1573,6 +1573,13 @@ static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_si if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) return TRUE; + /* drbd_submit_ee currently fails for one reason only: + * not being able to allocate enough bios. + * Is dropping the connection going to help? */ + spin_lock_irq(&mdev->req_lock); + list_del(&e->w.list); + spin_unlock_irq(&mdev->req_lock); + drbd_free_ee(mdev, e); fail: put_ldev(mdev); @@ -1998,6 +2005,16 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) return TRUE; + /* drbd_submit_ee currently fails for one reason only: + * not being able to allocate enough bios. + * Is dropping the connection going to help? */ + spin_lock_irq(&mdev->req_lock); + list_del(&e->w.list); + hlist_del_init(&e->colision); + spin_unlock_irq(&mdev->req_lock); + if (e->flags & EE_CALL_AL_COMPLETE_IO) + drbd_al_complete_io(mdev, e->sector); + out_interrupted: /* yes, the epoch_size now is imbalanced. * but we drop the connection anyways, so we don't have a chance to @@ -2202,6 +2219,14 @@ submit: if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) return TRUE; + /* drbd_submit_ee currently fails for one reason only: + * not being able to allocate enough bios. + * Is dropping the connection going to help? */ + spin_lock_irq(&mdev->req_lock); + list_del(&e->w.list); + spin_unlock_irq(&mdev->req_lock); + /* no drbd_rs_complete_io(), we are dropping the connection anyways */ + out_free_e: put_ldev(mdev); drbd_free_ee(mdev, e); diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index 88be45ad84ed..f12822d53867 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -387,6 +387,13 @@ static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) if (drbd_submit_ee(mdev, e, READ, DRBD_FAULT_RS_RD) == 0) return 0; + /* drbd_submit_ee currently fails for one reason only: + * not being able to allocate enough bios. + * Is dropping the connection going to help? */ + spin_lock_irq(&mdev->req_lock); + list_del(&e->w.list); + spin_unlock_irq(&mdev->req_lock); + drbd_free_ee(mdev, e); defer: put_ldev(mdev); diff --git a/include/linux/drbd.h b/include/linux/drbd.h index 5e72a5d3d48f..da7d9bd4f3f0 100644 --- a/include/linux/drbd.h +++ b/include/linux/drbd.h @@ -53,10 +53,10 @@ extern const char *drbd_buildtag(void); -#define REL_VERSION "8.3.8.1" +#define REL_VERSION "8.3.9rc1" #define API_VERSION 88 #define PRO_VERSION_MIN 86 -#define PRO_VERSION_MAX 94 +#define PRO_VERSION_MAX 95 enum drbd_io_error_p {