Re: [PATCH] net: phy: microchip_t1: fix NULL pointer dereference in lan887x_phy_init()

[Xuanqiang Luo <xuanqiang.luo@linux.dev>]

在 2026/9/2 16:33, huhai 写道:
> From: huhai <huhai@kylinos.cn>
>
> mchp_rds_ptp_probe() may return NULL when CONFIG_PTP_1588_CLOCK is disabled.

When CONFIG_MICROCHIP_PHY_RDS_PTP=n, the stub for
mchp_rds_ptp_probe() also returns NULL, even if
CONFIG_PTP_1588_CLOCK=y. Please mention this case in the commit message.

> lan887x_phy_init() only checks for an error pointer before using the returned
> clock to configure the periodic output pin, which can result in a NULL
> pointer dereference.
>
> Handle the NULL return as PTP being unavailable and skip the event pin
> configuration in that case.
>
> Fixes: 8541fc12edcd ("net: phy: microchip_t1: Enable pin out specific to lan887x phy for PEROUT signal")
> Signed-off-by: huhai <huhai@kylinos.cn>

Since this is a crash fix suitable for the net tree, please mark
the patch as [PATCH net] and add:

Cc: stable@vger.kernel.org

Thanks,
Xuanqiang