Messages in this thread | | | Date | Tue, 25 Sep 2018 11:15:05 -0400 (EDT) | From | Alan Stern <> | Subject | Re: [PATCH] usb: usbfs: fix crash in check_ctrlrecip()->usb_find_alt_setting() |
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On Tue, 25 Sep 2018, Vladis Dronov wrote:
> > What reason is there for having two different fixes for the same bug? > > This one isn't going to get into any mainline trees that don't already > > have c9a4cb204e9e. > > I believe this is the right thing to do, so usb_find_alt_setting() > is not called with a known-bad argument. > > Honestly, I would change "if (!config)" in usb_find_alt_setting() to > "BUG_ON(!config)" so we know when its callers do smth wrong and go
(You'll be lucky if Linus doesn't see that. He yells at anybody who suggests adding BUG_ON for anything that doesn't completely crash the kernel. The basic problem is that "BUG_ON" is not a good name: That routine doesn't really report bugs; instead it brings everything to a halt in situations where the kernel is unable to proceed. In practice this tends to make actual debugging more difficult.)
> fix callers. Unfortunately, I understand this hardly will be accepted.
How is this different from calling kfree() with a NULL argument?
Alan Stern
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