RE: [PATCH] mailbox: pcc: Fix an invalid-load caught by the address sanitizer

["Limonciello, Mario" <Mario.Limonciello@xxxxxxx>]

[Public]

> -----Original Message-----
> From: Sudeep Holla <sudeep.holla@xxxxxxx>
> Sent: Tuesday, May 10, 2022 09:47
> To: Limonciello, Mario <Mario.Limonciello@xxxxxxx>
> Cc: Jassi Brar <jassisinghbrar@xxxxxxxxx>; Sudeep Holla
> <sudeep.holla@xxxxxxx>; linux-acpi@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] mailbox: pcc: Fix an invalid-load caught by the address
> sanitizer
> 
> On Mon, May 09, 2022 at 09:17:16AM -0500, Mario Limonciello wrote:
> > `pcc_mailbox_probe` doesn't initialize all memory that has been allocated
> > before the first time that one of it's members `txdone_irq` may be
> > accessed.
> >
> > This leads to a an invalid load any time that this member is accessed:
> > [    2.429769] UBSAN: invalid-load in drivers/mailbox/pcc.c:684:22
> > [    2.430324] UBSAN: invalid-load in drivers/mailbox/mailbox.c:486:12
> > [    4.276782] UBSAN: invalid-load in drivers/acpi/cppc_acpi.c:314:45
> >
> > Link:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugz
> illa.kernel.org%2Fshow_bug.cgi%3Fid%3D215587&amp;data=05%7C01%7Cm
> ario.limonciello%40amd.com%7C2a6407ffdf5944577aee08da3293f29b%7C3dd
> 8961fe4884e608e11a82d994e183d%7C0%7C0%7C637877908262860256%7CUn
> known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6
> Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=lTXBFYCNnM
> Pt6KnL34rQWXT%2BZvdEwvmIdMWGI%2BfluCo%3D&amp;reserved=0
> > Fixes: ce028702ddbc ("mailbox: pcc: Move bulk of PCCT parsing into
> pcc_mbox_probe")
> 
> Thanks for catching and fixing this.
> 
> Reviewed-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> 
> --
> Regards,
> Sudeep

I'll take the credit for fixing, but I realized I forgot to add a link and attribution 
to the original reporter.  Here are some more tags to add:

Reported-by: erhard_f@xxxxxxxxxxx
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215587