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.