CVE-2026-80648pinctrl: spacemit: fix NULL check in spacemit_pin_set_config

Official description

In the Linux kernel, the following vulnerability has been resolved: pinctrl: spacemit: fix NULL check in spacemit_pin_set_config spacemit_pin_set_config() looks up the per-pin descriptor with spacemit_get_pin() then checks the wrong variable for failure: const struct spacemit_pin *spin = spacemit_get_pin(pctrl, pin); ... if (!pin) return -EINVAL; reg = spacemit_pin_to_reg(pctrl, spin->pin); pin is an unsigned int pin id, where 0 (GPIO_0 / gmac0_rxdv on K3) is a valid pin, so rejecting it here drops the PAD config write for the first pin of every group. On K3 Pico-ITX the GMAC RGMII group lists pin 0 as its first entry, so its drive-strength / bias configuration was silently ignored. The intended guard is against spacemit_get_pin() returning NULL when the pin id isn't in the SoC's pin table. Check spin instead, which both restores PAD setup for pin 0 and prevents a NULL deref on spin->pin.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/7a551951ebeb5b3f05bdb04a73d4593869c984c4
• https://git.kernel.org/stable/c/d3b53f0eda26e442ff97016ad4a0724db8fd3781
• https://git.kernel.org/stable/c/09c816e5c4d3a8d6d6e4b7537433e5e98505d934