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Subject[PATCH] block: prevent sending events from removed device
Date
Skip kobject_uevent_env in case the associated kobject
no longer exists, as calling kobject_uevent_env with
NULL is not safe.

Signed-off-by: Christian Loehle <cloehle@hyperstone.com>
---
block/genhd.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 9f8cb7beaad1..46629fbe23ae 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1655,8 +1655,16 @@ static void disk_check_events(struct disk_events *ev,
(disk->event_flags & DISK_EVENT_FLAG_UEVENT))
envp[nr_events++] = disk_uevents[i];

- if (nr_events)
- kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp);
+ if (nr_events) {
+ struct kobject *dev_kobj = kobject_get(&disk_to_dev(disk)->kobj);
+ /* The device kobject might have been removed in the
+ * meantime, so check for it first.
+ * If it was removed there is no need to signal events
+ */
+ if (!dev_kobj)
+ kobject_uevent_env(dev_kobj, KOBJ_CHANGE, envp);
+ kobject_put(dev_kobj);
+ }
}

/*
--
2.32.0
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