On Tue, 8 May 2007 11:57:07 -0400 (EDT) Alan Stern wrote:
> On Tue, 8 May 2007, Greg KH wrote:
>
> > > The problem was in drivers/usb/core/config.c in function
> > > usb_parse_interface:
> > > ---
> > > num_ep = num_ep_orig = alt->desc.bNumEndpoints;
> > > ...
> > > len = sizeof(struct usb_host_endpoint) * num_ep;
> > > alt->endpoint = kzalloc(len, GFP_KERNEL);
> > > ---
> > >
> > > num_ep can be 0, as it was in my case, so following patch makes this
> > > situation more obvious
> > > and clear.
>
> How about instead just doing:
>
> + num_ep = max(num_ep, 1);
> len = sizeof(struct usb_host_endpoint) * num_ep;
>
> Also, wasn't it true at one point that it was legal to call kmalloc() with
> a length of 0? ISTR seeing somewhere that it's true for regular malloc().
kmalloc(0) was legal with CONFIG_SLAB=y. However, there is now
something called SLUB, which just returned an error when size == 0.
It has recently been modified to mirror the SLAB behavior but also
do a stack dump so that "bad" callers can be fixed.
---
~Randy
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