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media: rc: do not access device via sysfs after rc_unregister_device()

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Device drivers do not expect to have change_protocol or wakeup
re-programming to be accesed after rc_unregister_device(). This can
cause the device driver to access deallocated resources.

Cc: <stable@vger.kernel.org> # 4.16+
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sean Young 2020-08-08 13:38:02 +02:00 committed by Mauro Carvalho Chehab
parent 4f0835d667
commit a2e2d73fa2
1 changed files with 12 additions and 0 deletions
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12
drivers/media/rc/rc-main.c
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@ -1292,6 +1292,10 @@ static ssize_t store_protocols(struct device *device,
}
mutex_lock(&dev->lock);
if (!dev->registered) {
mutex_unlock(&dev->lock);
return -ENODEV;
}
old_protocols = *current_protocols;
new_protocols = old_protocols;
@ -1430,6 +1434,10 @@ static ssize_t store_filter(struct device *device,
return -EINVAL;
mutex_lock(&dev->lock);
if (!dev->registered) {
mutex_unlock(&dev->lock);
return -ENODEV;
}
new_filter = *filter;
if (fattr->mask)
@ -1544,6 +1552,10 @@ static ssize_t store_wakeup_protocols(struct device *device,
int i;
mutex_lock(&dev->lock);
if (!dev->registered) {
mutex_unlock(&dev->lock);
return -ENODEV;
}
allowed = dev->allowed_wakeup_protocols;