Re: [PATCH] ptp: guard ptp_clock_gettime() if neither gettimex64 nor

[Kuniyuki Iwashima]

From: Richard Cochran <richardcochran@xxxxxxxxx>
Date: Tue, 28 Oct 2025 07:09:41 -0700
> On Tue, Oct 28, 2025 at 05:51:43PM +0800, Junjie Cao wrote:
> > Syzbot reports a NULL function pointer call on arm64 when
> > ptp_clock_gettime() falls back to ->gettime64() and the driver provides
> > neither ->gettimex64() nor ->gettime64(). This leads to a crash in the
> > posix clock gettime path.
> 
> Drivers must provide a gettime method.
> 
> If they do not, then that is a bug in the driver.

AFAICT, only GVE does not have gettime() and settime(), and
Tim (CCed) was preparing a fix and mostly ready to post it.