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authorMadhuparna Bhowmik <madhuparnabhowmik10@gmail.com>2020-06-04 16:51:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 19:06:26 -0700
commite1c3cdb26ab881b77486dc50370356a349077c74 (patch)
treedc5ef6ebebbdc59ab3c4ecedbe8d574a72abb0c1 /drivers/rapidio
parent762a3af6faa0682e5b30b67b1db156c7df55f2c7 (diff)
downloadlinux-e1c3cdb26ab881b77486dc50370356a349077c74.tar.bz2
rapidio: avoid data race between file operation callbacks and mport_cdev_add().
Fields of md(mport_dev) are set after cdev_device_add(). However, the file operation callbacks can be called after cdev_device_add() and therefore accesses to fields of md in the callbacks can race with the rest of the mport_cdev_add() function. One such example is INIT_LIST_HEAD(&md->portwrites) in mport_cdev_add(), the list is initialised after cdev_device_add(). This can race with list_add_tail(&pw_filter->md_node,&md->portwrites) in rio_mport_add_pw_filter() which is called by unlocked_ioctl. To avoid such data races use cdev_device_add() after initializing md. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Alexandre Bounine <alex.bou9@gmail.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: Mike Marshall <hubcap@omnibond.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Allison Randal <allison@lohutok.net> Cc: Pavel Andrianov <andrianov@ispras.ru> Link: http://lkml.kernel.org/r/20200426112950.1803-1-madhuparnabhowmik10@gmail.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio')
-rw-r--r--drivers/rapidio/devices/rio_mport_cdev.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index 10af330153b5..0b85a80ae7ef 100644
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -2384,13 +2384,6 @@ static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
cdev_init(&md->cdev, &mport_fops);
md->cdev.owner = THIS_MODULE;
- ret = cdev_device_add(&md->cdev, &md->dev);
- if (ret) {
- rmcd_error("Failed to register mport %d (err=%d)",
- mport->id, ret);
- goto err_cdev;
- }
-
INIT_LIST_HEAD(&md->doorbells);
spin_lock_init(&md->db_lock);
INIT_LIST_HEAD(&md->portwrites);
@@ -2410,6 +2403,13 @@ static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
#else
md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
#endif
+
+ ret = cdev_device_add(&md->cdev, &md->dev);
+ if (ret) {
+ rmcd_error("Failed to register mport %d (err=%d)",
+ mport->id, ret);
+ goto err_cdev;
+ }
ret = rio_query_mport(mport, &attr);
if (!ret) {
md->properties.flags = attr.flags;