drbd: fix potential kernel BUG (NULL deref)

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BUG trace would look like:
 lc_find
 drbd_rs_complete_io
 got_OVResult
 drbd_asender

Could be triggered by explicit, or IO-error policy based,
detach during online-verify.

We may only dereference mdev->resync, if we first get_ldev(), as the
disk may break any time, causing mdev->resync to disappear once all
ldev references have been returned.
Already in flight online-verify requests or replies may still come in,
which we then need to ignore.

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 2010-09-05 01:13:24 +02:00 • committed by Philipp Reisner

parent 435f07402b

commit 1d53f09e17

2 changed files with 19 additions and 6 deletions

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15

drivers/block/drbd/drbd_receiver.c

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10

drivers/block/drbd/drbd_worker.c

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