net: phylink: correctly validate returned PCS in phylink_inband_caps

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In the Linux kernel, the following vulnerability has been resolved: net: phylink: correctly validate returned PCS in phylink_inband_caps In phylink_inband_caps(), the PCS returned by mac_select_pcs is only checked if NULL but mac_select_pcs can also return an error pointer. This can cause a kernel panic as phylink_pcs_inband_caps() only checks if passed PCS is not NULL and directly dereference ops from the phylink_pcs struct. Use the IS_ERR_OR_NULL macro to address both case where the returned PCS can be NULL or an error pointer and prevent a kernel panic.

Source published

11 Sep 2026 19:42:49 UTC

Source modified

19 Oct 2026 08:46:17 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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