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82e5d7d793The mtk-socinfo grabs the NVMEM device devm_nvmem_device_get(), but then
proceeds to put the device directly with nvmem_device_put() if the read
is successful. If the device fails to probe and goes through the devres
release path, the device would be put a second time, triggering a
use-after-free error from KASAN.
Fix this by dropping the devres part. Since the NVMEM cell data is read
only once, there is no need to keep the reference around.
While at it, clean up the function to directly reference the NVMEM
device node and use that to find the NVMEM device, instead of finding it
by name, which is more fragile. The cell node is always a direct child
of the NVMEM device node, courtesy of the legacy NVMEM cell layout. Thus
of_get_child_by_name() is a better way of finding the cell. Last,
correctly put the device node once its use is over.
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.