| commit | 1ff36a0e02f978e533b13ce6a86ad6a73444cec8 | |
| author | Jens Axboe <jaxboe@fusionio.com> | |
| Sun, 5 Jun 2011 04:01:13 +0000 (5 06:01 +0200) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Wed, 13 Jul 2011 03:29:24 +0000 (13 05:29 +0200) | ||
| tree | f51ea39985a7b77710aae2552a4df1204c10a90e | treesnapshot (tar.gz zip) |
| parent | 336fca97910371e16506e5448ad0ca9daae9a59c | commitdiff |
cfq-iosched: fix locking around ioc->ioc_data assignment
commit ab4bd22d3cce6977dc039664cc2d052e3147d662 upstream.
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.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit ab4bd22d3cce6977dc039664cc2d052e3147d662 upstream.
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.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| block/cfq-iosched.c | diffblobblamehistory |