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net: cavium: fix NULL pointer dereference in cavium_ptp_put 

Prevent a kernel panic on reboot if ptp_clock is NULL by checking
the ptp pointer before using it.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Fixes: 8c56df372b ("net: add support for Cavium PTP coprocessor")
Cc: Radoslaw Biernacki <rad@semihalf.com>
Cc: Aleksey Makarov <aleksey.makarov@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Jan Glauber 2018-02-12 18:20:11 +01:00 committed by David S. Miller
parent 027d351c54
commit 07a2e1cf39
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/cavium/common/cavium_ptp.c
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@ -75,6 +75,8 @@ EXPORT_SYMBOL(cavium_ptp_get);
void cavium_ptp_put(struct cavium_ptp *ptp)
{
if (!ptp)
return;
pci_dev_put(ptp->pdev);
}
EXPORT_SYMBOL(cavium_ptp_put);