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| author | Jens Axboe <jaxboe@fusionio.com> | 2011-06-05 04:01:13 (GMT) |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-06-06 03:57:21 (GMT) |
| commit | 9b50902db5eb8a220160fb89e95aa11967998d12 (patch) | |
| tree | ad025360c616398f2b0aea1f0789a2f8174496b1 /block/blk-softirq.c | |
| parent | 796d5116c407690b14fd5bda136aa67a39e7061a (diff) | |
| download | linux-fsl-qoriq-9b50902db5eb8a220160fb89e95aa11967998d12.tar.xz | |
cfq-iosched: fix locking around ioc->ioc_data assignment
Since we are modifying this RCU pointer, we need to hold
the lock protecting it around it.
This fixes a potential reuse and double free of a cfq
io_context structure. The bug has been in CFQ for a long
time, it hit very few people but those it did hit seemed
to see it a lot.
Tracked in RH bugzilla here:
https://bugzilla.redhat.com/show_bug.cgi?id=577968
Credit goes to Paul Bolle for figuring out that the issue
was around the one-hit ioc->ioc_data cache. Thanks to his
hard work the issue is now fixed.
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-softirq.c')
0 files changed, 0 insertions, 0 deletions