RE: [PATCH 1/2] usb: renesas_usbhs: avoid NULL pointer derefernce in usbhsf_pkt_handler()

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Hi Felipe,

> Hi Yoshihiro,
> 
> Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> writes:
> > [ text/plain ]
> > When unexpected situation happened (e.g. tx/rx irq happened while
> > DMAC is used), the usbhsf_pkt_handler() was possible to cause NULL
> > pointer dereference like the followings:
> >
> > Unable to handle kernel NULL pointer dereference at virtual address 00000000
> > pgd = c0004000
> > [00000000] *pgd=00000000
> > Internal error: Oops: 80000007 [#1] SMP ARM
> > Modules linked in: usb_f_acm u_serial g_serial libcomposite
> > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc6-00842-gac57066-dirty #63
> > Hardware name: Generic R8A7790 (Flattened Device Tree)
> > task: c0729c00 ti: c0724000 task.ti: c0724000
> > PC is at 0x0
> > LR is at usbhsf_pkt_handler+0xac/0x118
> > pc : [<00000000>]    lr : [<c03257e0>]    psr: 60000193
> > sp : c0725db8  ip : 00000000  fp : c0725df4
> > r10: 00000001  r9 : 00000193  r8 : ef3ccab4
> > r7 : ef3cca10  r6 : eea4586c  r5 : 00000000  r4 : ef19ceb4
> > r3 : 00000000  r2 : 0000009c  r1 : c0725dc4  r0 : ef19ceb4
> >
> > This patch adds a condition to avoid the dereference.
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> 
> is this a regression fix ? Do we need it in current -rc (it's getting
> late for that, actually), do we need a Cc: <stable> here ?
> 
> Same questions are valid for the other patch in this series.

Thank you for the review.
This is a potential problem fix. This issue is possible to cause the first
DMA supporting (e73a989 usb: renesas_usbhs: add DMAEngine support) at 2011, I think.

We don't need in current -rc because I also think this is too late for it.
I'm not sure we need a CC here.

Best regards,
Yoshihiro Shimoda

> --
> balbi



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