CVE-2026-98528

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.