gpio: cdev: fix kernel stack leak to user-space in error path

In the Linux kernel, the following vulnerability has been resolved: gpio: cdev: fix kernel stack leak to user-space in error path If we fail to acquire the GPIO chip guard in gpio_desc_to_lineinfo(), we return immediately before zeroing the info struct we'll end up passing to the user-space later in lineinfo_get_v1(). This may leak the kernel stack contents. Make gpio_desc_to_lineinfo() return int so that the -ENODEV returned on failure to acquire the guard can be propagated to the callers. While not strictly necessary: move the memset() before trying to acquire the SRCU read lock too for good measure.

Source published

18 Oct 2026 15:17:46 UTC

Source modified

19 Oct 2026 09:21:10 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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