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ptp: fix NULL pointer dereference in ptp_clock_register

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Fix NULL pointer dereference in ptp_clock_register. The argument
"parent" of ptp_clock_register may be NULL pointer.

Fixes: 73f37068d5 ("ptp: support ptp physical/virtual clocks conversion")
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yangbo Lu 2021-07-05 16:53:06 +08:00 committed by David S. Miller
parent 6ff63a150b
commit 55eac20617
1 changed files with 1 additions and 1 deletions
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2
drivers/ptp/ptp_clock.c
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@ -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;