CVE-2026-98825rtc: mpfs: fix unchecked devm_clk_get() error pointer in probe()

Official description

In the Linux kernel, the following vulnerability has been resolved: rtc: mpfs: fix unchecked devm_clk_get() error pointer in probe() devm_clk_get(&pdev->dev, "rtcref")'s return value was passed straight into clk_get_rate() without checking it for an error first, unlike the "rtc" clock a few lines above which is correctly checked with IS_ERR(). clk_get_rate() only guards against a NULL clk, not an error pointer: if (!clk) return 0; ... rate = clk_core_get_rate_recalc(clk->core); so if devm_clk_get() ever returns an error pointer here (for example ERR_PTR(-EPROBE_DEFER), which is the normal, expected outcome if the clkcfg clock-provider this RTC depends on has not registered its clocks yet by the time this driver probes), clk_get_rate() dereferences that error pointer instead of returning 0, crashing instead of letting probe defer. Capture the clock in the existing 'clk' local and check it with IS_ERR() before calling clk_get_rate(), matching the handling already used for the "rtc" clock in this same function.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/7f59e824a4403e156cf930fe556b75139452099e
• https://git.kernel.org/stable/c/ab741d1b714b4acc605f3d14cdc4120f87341ed1
• https://git.kernel.org/stable/c/74dc7c52946e3d47c40edd0875adb7cc15937066
• https://git.kernel.org/stable/c/cfd70c9b19846c524f2b6195a7484bdf22071ccf
• https://git.kernel.org/stable/c/8a03f8422fa08eed335c51bccb612a3d81739ff2
• https://git.kernel.org/stable/c/ac41b05d15db3134e839148290d67415ee0bdb58