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Bug#1123987: UBSAN: array-index-out-of-bounds in ucsi.c

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  Bug#1123987: UBSAN: array-index-out-of-bounds in ucsi.c Salvatore Bonaccorso <carnil@debian.org> - 2026-01-17 10:50 +0100
    Bug#1123987: Solved: Bug#1123987: UBSAN: array-index-out-of-bounds in ucsi.c <pdormeau@free.fr> - 2026-01-17 14:30 +0100

#90852 — Bug#1123987: UBSAN: array-index-out-of-bounds in ucsi.c

Hi Pascal,

On Sat, Jan 17, 2026 at 06:37:29AM +0100, pdormeau@free.fr wrote:
> 
> Le Sat, 17 Jan 2026 00:10:39 +0100,
> Salvatore Bonaccorso <carnil@debian.org> a écrit :
> 
> >So as per upstream discussion this is a firmware bug and the issue
> >should be reported to Lenovo accordingly.
> >
> >https://lore.kernel.org/linux-usb/aWizCe9um6ZrKfbT@kuha/
> >
> >Pascal can you do that? I will close this Linux kernel.
> >
> >Regards,
> >Salvatore
> Thank you Salvatore,
> I already reported to the customer service.
> They asked me to upgrade to the latest BIOS firmware.
> Will do that soon, then report again to Lenovo if it does not solve the
> problem.

Ack!

> It is an entry level laptop and I fear they answer that they only
> support Windows. Bad luck because we have 2 other Lenovo laptops
> here that run without any problem under Linux.
> PS : I saw that a patch has been proposed as a RFC on the kernel list.
> I will also test it.

About the patch: AFAIU it won't be accepted, because it's believed
that the issue should be handled in the broken firmware. But we can
see how the thing proceeds.

Regards,
Salvatore

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#90853 — Bug#1123987: Solved: Bug#1123987: UBSAN: array-index-out-of-bounds in ucsi.c

Le Sat, 17 Jan 2026 08:44:22 +0100,
Salvatore Bonaccorso <carnil@debian.org> a écrit :
>> Thank you Salvatore,
>> I already reported to the customer service.
>> They asked me to upgrade to the latest BIOS firmware.
>> Will do that soon, then report again to Lenovo if it does not solve
>> the problem.  
Good news, latest firmware (issued on January 12th) solves the issue 
(Do Lenovo people read the kernel list ?).
Big thanks Salvatore,
And best regards

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