CVE-2022-48975

In the Linux kernel, the following vulnerability has been resolved:

gpiolib: fix memory leak in gpiochipsetupdev()

Here is a backtrace report about memory leak detected in gpiochipsetupdev():

unreferenced object 0xffff88810b406400 (size 512): comm "python3", pid 1682, jiffies 4295346908 (age 24.090s) backtrace: kmalloctrace deviceadd deviceprivateinit at drivers/base/core.c:3361 (inlined by) deviceadd at drivers/base/core.c:3411 cdevdeviceadd gpiolibcdevregister gpiochipsetupdev gpiochipadddatawith_key

gcdevregister() & gcdevunregister() would call deviceadd() & devicedel() (no matter CONFIGGPIOCDEV is enabled or not) to register/unregister device.

However, if deviceadd() succeeds, some resource (like struct deviceprivate allocated by deviceprivateinit()) is not released by device_del().

Therefore, after deviceadd() succeeds by gcdevregister(), it needs to call put_device() to release resource in the error handle path.

Here we move forward the register of release function, and let it release every piece of resource by put_device() instead of kfree().

While at it, fix another subtle issue, i.e. when gc->ngpio is equal to 0, we still call kcalloc() and, in case of further error, kfree() on the ZERO_PTR pointer, which is not NULL. It's not a bug per se, but rather waste of the resources and potentially wrong expectation about contents of the gdev->descs variable.