Patch name: md-fix-null-pointer-deref.patch
Fix NULL pointer dereference.
When the module parameter 'start_dirty_degraded' is set, the
RAID is not in sync, and a drive needs to be rebuilt, there
will be BUG() called when finished because 'sysfs_notify_dirent'
is called with a NULL argument. (rdev->sysfs_state is not
always set.)
Signed-off-by: Jonathan Brassow <jbrassow@xxxxxxxxxx>
Index: linux-2.6/drivers/md/md.c
===================================================================
--- linux-2.6.orig/drivers/md/md.c
+++ linux-2.6/drivers/md/md.c
@@ -7227,6 +7227,8 @@ static int __init md_init(void)
raid_table_header = register_sysctl_table(raid_root_table);
md_geninit();
+ if (start_dirty_degraded)
+ printk(KERN_INFO "md: start_dirty_degraded set\n");
return 0;
}
Index: linux-2.6/drivers/md/raid5.c
===================================================================
--- linux-2.6.orig/drivers/md/raid5.c
+++ linux-2.6/drivers/md/raid5.c
@@ -5339,7 +5339,7 @@ static int raid5_spare_active(mddev_t *m
&& !test_bit(Faulty, &tmp->rdev->flags)
&& !test_and_set_bit(In_sync, &tmp->rdev->flags)) {
count++;
- sysfs_notify_dirent(tmp->rdev->sysfs_state);
+ sysfs_notify_dirent_safe(tmp->rdev->sysfs_state);
}
}
spin_lock_irqsave(&conf->device_lock, flags);
--
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