nvmem: core: fix cleanup after dev_set_name()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: nvmem: core: fix cleanup after dev_set_name() If dev_set_name() fails, we leak nvmem->wp_gpio as the cleanup does not put this. While a minimal fix for this would be to add the gpiod_put() call, we can do better if we split device_register(), and use the tested nvmem_release() cleanup code by initialising the device early, and putting the device. This results in a slightly larger fix, but results in clear code. Note: this patch depends on "nvmem: core: initialise nvmem->id early" and "nvmem: core: remove nvmem_config wp_gpio". [Srini: Fixed subject line and error code handing with wp_gpio while applying.]

References

• https://git.kernel.org/stable/c/23676ecd2eb377f7c24a6ff578b0f4c7135658b6
• https://git.kernel.org/stable/c/8f9c4b2a3b132bf6698e477aba6ee194b40c75f4
• https://git.kernel.org/stable/c/39708bc8da7858de0bed9b3a88b3beb1d1e0b443
• https://git.kernel.org/stable/c/560181d3ace61825f4ca9dd3481d6c0ee6709fa8