From 55eac20617ca84129273ab248f4d7bfe456967de Mon Sep 17 00:00:00 2001 From: Yangbo Lu Date: Mon, 5 Jul 2021 16:53:06 +0800 Subject: [PATCH] ptp: fix NULL pointer dereference in ptp_clock_register Fix NULL pointer dereference in ptp_clock_register. The argument "parent" of ptp_clock_register may be NULL pointer. Fixes: 73f37068d540 ("ptp: support ptp physical/virtual clocks conversion") Reported-by: kernel test robot Signed-off-by: Yangbo Lu Signed-off-by: David S. Miller --- drivers/ptp/ptp_clock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c index f012fa5..ce6d9fc 100644 --- a/drivers/ptp/ptp_clock.c +++ b/drivers/ptp/ptp_clock.c @@ -236,7 +236,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, } /* PTP virtual clock is being registered under physical clock */ - if (parent->class && parent->class->name && + if (parent && parent->class && parent->class->name && strcmp(parent->class->name, "ptp") == 0) ptp->is_virtual_clock = true; -- 2.7.4