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bcma: Fix memory leak for internally-handled cores

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kmemleak reported that dev_name() of internally-handled cores were leaked
on driver unbinding. Let's use device_initialize() to take refcounts for
them and put_device() to properly free the related stuff.

While looking at it, there's another potential issue for those which should
be *registered* into driver core. If device_register() failed, we put
device once and freed bcma_device structures. In bcma_unregister_cores(),
they're treated as unregistered and we hit both UAF and double-free. That
smells not good and has also been fixed now.

Fixes: ab54bc8460 ("bcma: fill core details for every device")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210727025232.663-2-yuzenghui@huawei.com
This commit is contained in:
Zenghui Yu 2021-07-27 10:52:31 +08:00 committed by Kalle Valo
parent aee7c86a61
commit b63aed3ff1
1 changed files with 3 additions and 3 deletions
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6
drivers/bcma/main.c
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@ -236,6 +236,7 @@ EXPORT_SYMBOL(bcma_core_irq);
void bcma_prepare_core(struct bcma_bus *bus, struct bcma_device *core)
{
device_initialize(&core->dev);
core->dev.release = bcma_release_core_dev;
core->dev.bus = &bcma_bus_type;
dev_set_name(&core->dev, "bcma%d:%d", bus->num, core->core_index);
@ -277,11 +278,10 @@ static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core)
{
int err;
err = device_register(&core->dev);
err = device_add(&core->dev);
if (err) {
bcma_err(bus, "Could not register dev for core 0x%03X\n",
core->id.id);
put_device(&core->dev);
return;
}
core->dev_registered = true;
@ -372,7 +372,7 @@ void bcma_unregister_cores(struct bcma_bus *bus)
/* Now noone uses internally-handled cores, we can free them */
list_for_each_entry_safe(core, tmp, &bus->cores, list) {
list_del(&core->list);
kfree(core);
put_device(&core->dev);
}
}