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Commitf7b687d6b6("staging: r8188eu: remove NumTotalRFPath from struct hal_data_8188e") removed a for loop around a block of code that is executed only once when i == 0. However, without the for loop, i will never be set to 0 before the code block is executed. i remains at 2, which is the final value after the previous loop. This results in a write past the end of the powerlevel and MCSBase arrays. [ 28.480809] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: rtl8188e_PHY_RF6052SetOFDMTxPower+0x124/0x128 [r8188eu] [ 28.493752] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: rtl8188e_PHY_RF6052SetOFDMTxPower+0x124/0x128 [r8188eu] ]--- Fix this by replacing i with 0 in the code block that used to be the body of the loop. While at it, remove the powerlevel array that was just holding a temporary value. Tested with Edimax EW-7811Un V2 on an ARM32 embedded system. Fixes:f7b687d6b6("staging: r8188eu: remove NumTotalRFPath from struct hal_data_8188e") Acked-by: Michael Straube <straube.linux@gmail.com> Signed-off-by: Martin Kaiser <martin@kaiser.cx> Link: https://lore.kernel.org/r/20210918134024.23837-1-martin@kaiser.cx Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.