This is a note to let you know that I've just added the patch titled
dm: fix a race condition in dm_get_md
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-fix-a-race-condition-in-dm_get_md.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 2bec1f4a8832e74ebbe859f176d8a9cb20dd97f4 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <[email protected]>
Date: Tue, 17 Feb 2015 14:30:53 -0500
Subject: dm: fix a race condition in dm_get_md
From: Mikulas Patocka <[email protected]>
commit 2bec1f4a8832e74ebbe859f176d8a9cb20dd97f4 upstream.
The function dm_get_md finds a device mapper device with a given dev_t,
increases the reference count and returns the pointer.
dm_get_md calls dm_find_md, dm_find_md takes _minor_lock, finds the
device, tests that the device doesn't have DMF_DELETING or DMF_FREEING
flag, drops _minor_lock and returns pointer to the device. dm_get_md then
calls dm_get. dm_get calls BUG if the device has the DMF_FREEING flag,
otherwise it increments the reference count.
There is a possible race condition - after dm_find_md exits and before
dm_get is called, there are no locks held, so the device may disappear or
DMF_FREEING flag may be set, which results in BUG.
To fix this bug, we need to call dm_get while we hold _minor_lock. This
patch renames dm_find_md to dm_get_md and changes it so that it calls
dm_get while holding the lock.
Signed-off-by: Mikulas Patocka <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/md/dm.c | 27 ++++++++++-----------------
1 file changed, 10 insertions(+), 17 deletions(-)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2270,7 +2270,7 @@ int dm_setup_md_queue(struct mapped_devi
return 0;
}
-static struct mapped_device *dm_find_md(dev_t dev)
+struct mapped_device *dm_get_md(dev_t dev)
{
struct mapped_device *md;
unsigned minor = MINOR(dev);
@@ -2281,12 +2281,15 @@ static struct mapped_device *dm_find_md(
spin_lock(&_minor_lock);
md = idr_find(&_minor_idr, minor);
- if (md && (md == MINOR_ALLOCED ||
- (MINOR(disk_devt(dm_disk(md))) != minor) ||
- dm_deleting_md(md) ||
- test_bit(DMF_FREEING, &md->flags))) {
- md = NULL;
- goto out;
+ if (md) {
+ if ((md == MINOR_ALLOCED ||
+ (MINOR(disk_devt(dm_disk(md))) != minor) ||
+ dm_deleting_md(md) ||
+ test_bit(DMF_FREEING, &md->flags))) {
+ md = NULL;
+ goto out;
+ }
+ dm_get(md);
}
out:
@@ -2294,16 +2297,6 @@ out:
return md;
}
-
-struct mapped_device *dm_get_md(dev_t dev)
-{
- struct mapped_device *md = dm_find_md(dev);
-
- if (md)
- dm_get(md);
-
- return md;
-}
EXPORT_SYMBOL_GPL(dm_get_md);
void *dm_get_mdptr(struct mapped_device *md)
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/dm-snapshot-fix-a-possible-invalid-memory-access-on-unload.patch
queue-3.10/dm-fix-a-race-condition-in-dm_get_md.patch
queue-3.10/dm-mirror-do-not-degrade-the-mirror-on-discard-error.patch
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