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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 <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2010-09-14 20:40:41 +02:00 committed by Philipp Reisner
parent af85e8e83d
commit 22cc37a943
3 changed files with 34 additions and 2 deletions
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25
drivers/block/drbd/drbd_receiver.c
View File

@ -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);

7
drivers/block/drbd/drbd_worker.c
View File

@ -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);

4
include/linux/drbd.h
View File

@ -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 {