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From: Richard Cochran <richardcochran@gmail.com>
To: Junjie Cao <junjie.cao@intel.com>
Cc: Andrew Lunn <andrew+netdev@lunn.ch>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	syzkaller-bugs@googlegroups.com,
	syzbot+c8c0e7ccabd456541612@syzkaller.appspotmail.com
Subject: Re: [PATCH] ptp: guard ptp_clock_gettime() if neither gettimex64 nor
Date: Tue, 28 Oct 2025 07:09:41 -0700	[thread overview]
Message-ID: <aQDOpeQIU1G4nA1F@hoboy.vegasvil.org> (raw)
In-Reply-To: <20251028095143.396385-1-junjie.cao@intel.com>

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.

Thanks,
Richard

  parent reply	other threads:[~2025-10-28 14:09 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-28  9:51 Junjie Cao
2025-10-28 12:58 ` Pavan Chebbi
2025-10-28 14:09 ` Richard Cochran [this message]
2025-10-28 15:51   ` Kuniyuki Iwashima
2025-10-28 23:13     ` Jakub Kicinski
2025-10-28 23:45       ` Vadim Fedorenko
2025-10-28 23:54         ` Kuniyuki Iwashima
2025-10-28 23:56           ` Kuniyuki Iwashima
2025-10-28 23:56           ` Vadim Fedorenko
2025-10-29 16:37             ` Tim Hostetler
2025-10-29 18:55               ` Vadim Fedorenko

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