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Fabio Checconi 4faa3c8150 cfq-iosched: do not leak ioc_data across iosched switches ... When switching scheduler from cfq, cfq_exit_queue() does not clear ioc->ioc_data, leaving a dangling pointer that can deceive the following lookups when the iosched is switched back to cfq. The pattern that can trigger that is the following: - elevator switch from cfq to something else; - module unloading, with elv_unregister() that calls cfq_free_io_context() on ioc freeing the cic (via the .trim op); - module gets reloaded and the elevator switches back to cfq; - reallocation of a cic at the same address as before (with a valid key). To fix it just assign NULL to ioc_data in __cfq_exit_single_io_context(), that is called from the regular exit path and from the elevator switching code. The only path that frees a cic and is not covered is the error handling one, but cic's freed in this way are never cached in ioc_data. Signed-off-by: Fabio Checconi <fabio@gandalf.sssup.it> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		17 years ago
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Kconfig	Only enable BLOCK_COMPAT if COMPAT is needed	18 years ago
Kconfig.iosched	…
Makefile	block: ll_rw_blk.c split, add blk-merge.c	17 years ago
as-iosched.c	block: kill swap_io_context()	17 years ago
blk-barrier.c	block: fix blkdev_issue_flush() not detecting and passing EOPNOTSUPP back	17 years ago
blk-core.c	unexport blk_{get,put}_queue	17 years ago
blk-exec.c	block: make core bits checkpatch compliant	17 years ago
blk-ioc.c	cfq-iosched: add hlist for browsing parallel to the radix tree	17 years ago
blk-map.c	block: fix shadowed variable warning in blk-map.c	17 years ago
blk-merge.c	block: restore the meaning of rq->data_len to the true data length	17 years ago
blk-settings.c	Fix bounce setting for 64-bit	17 years ago
blk-sysfs.c	block: make core bits checkpatch compliant	17 years ago
blk-tag.c	block/blk-tag.c should #include "blk.h"	17 years ago
blk.h	proper prototype for blk_dev_init()	17 years ago
blktrace.c	blktrace: Add blktrace ioctls to SCSI generic devices	17 years ago
bsg.c	block: restore the meaning of rq->data_len to the true data length	17 years ago
cfq-iosched.c	cfq-iosched: do not leak ioc_data across iosched switches	17 years ago
compat_ioctl.c	blktrace: Add blktrace ioctls to SCSI generic devices	17 years ago
deadline-iosched.c	block: let elv_register() return void	17 years ago
elevator.c	elevator: make elevator_get() attempt to load the appropriate module	17 years ago
genhd.c	genhd must_check warning fix	17 years ago
ioctl.c	compat_ioctl: move common block ioctls to compat_blkdev_ioctl	18 years ago
noop-iosched.c	block: let elv_register() return void	17 years ago
scsi_ioctl.c	block: restore the meaning of rq->data_len to the true data length	17 years ago