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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-16 21:20:14 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-19 11:03:36 +0100 |
| commit | ddaf098ea779b3c1302c7843f6ff01e89b1fd380 (patch) | |
| tree | 50bab0c29d67b5924ac954ca82832fef67c51ba6 /drivers/base | |
| parent | 1e94be78ec1556e90056ac038b15231723d315a9 (diff) | |
| download | linux-stable-ddaf098ea779b3c1302c7843f6ff01e89b1fd380.tar.gz linux-stable-ddaf098ea779b3c1302c7843f6ff01e89b1fd380.tar.bz2 linux-stable-ddaf098ea779b3c1302c7843f6ff01e89b1fd380.zip | |
driver core: class: properly reference count class_dev_iter()
When class_dev_iter is initialized, the reference count for the subsys
private structure is incremented, but never decremented, causing a
memory leak over time. To resolve this, save off a pointer to the
internal structure into the class_dev_iter structure and then when the
iterator is finished, drop the reference count.
Reported-and-tested-by: syzbot+e7afd76ad060fa0d2605@syzkaller.appspotmail.com
Fixes: 7b884b7f24b4 ("driver core: class.c: convert to only use class_to_subsys")
Reported-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Cc: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Tested-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Link: https://lore.kernel.org/r/2023051610-stove-condense-9a77@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/class.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/base/class.c b/drivers/base/class.c index ac1808d1a2e8..05d9df90f621 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -320,6 +320,7 @@ void class_dev_iter_init(struct class_dev_iter *iter, const struct class *class, start_knode = &start->p->knode_class; klist_iter_init_node(&sp->klist_devices, &iter->ki, start_knode); iter->type = type; + iter->sp = sp; } EXPORT_SYMBOL_GPL(class_dev_iter_init); @@ -361,6 +362,7 @@ EXPORT_SYMBOL_GPL(class_dev_iter_next); void class_dev_iter_exit(struct class_dev_iter *iter) { klist_iter_exit(&iter->ki); + subsys_put(iter->sp); } EXPORT_SYMBOL_GPL(class_dev_iter_exit); |