The following commit has been merged in the master branch:
commit 930d8ee638112ca8bf27a9528c0a527cfab54c7d
Author: Mark Vitale <[email protected]>
Date: Fri Aug 17 18:48:08 2018 -0400
volser: ensure GCTrans transaction walk remains valid
Commit bc56f5cc97a982ee29219e6f258b372dbfe1a020 ("volser: Delete
timed-out temporary volumes") introduced new logic to GCTrans().
Unfortunately, part of this logic temporarily drops VTRANS_LOCK in order
to call VPurgeVolume(). While this lock is dropped, other volser_trans
may be added or deleted from the allTrans list. Therefore, GCTrans
should not trust the next pointer (nt = tt->next) which was obtained
before the lock was dropped.
One symptom observed in the field was a segfault while examining
tt->volume. Neither tt nor volume were valid any longer, since tt had
been set from a stale nt at the top of the loop.
To repair, improve, and clarify this logic:
- Refactor so nt is assigned correctly and as late as possible.
- Add comments to explain the placement of the assigns to future
maintainers.
Change-Id: Ibd3a504bddd3622730aa349576341e20f2f27836
Reviewed-on: https://gerrit.openafs.org/13286
Reviewed-by: Benjamin Kaduk <[email protected]>
Tested-by: BuildBot <[email protected]>
src/volser/voltrans.c | 20 +++++++++++++++++---
1 files changed, 17 insertions(+), 3 deletions(-)
--
OpenAFS Master Repository
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