In the Linux kernel, the following vulnerability has been resolved:
pwm: mediatek: Prevent divide-by-zero in pwmmediatekconfig()
With CONFIGCOMPILETEST && !CONFIGHAVECLK, pwmmediatekconfig() has a divide-by-zero in the following line:
do_div(resolution, clk_get_rate(pc->clk_pwms[pwm->hwpwm]));
due to the fact that the !CONFIGHAVECLK version of clkgetrate() returns zero.
This is presumably just a theoretical problem: COMPILETEST overrides the dependency on RALINK which would select COMMONCLK. Regardless it's a good idea to check for the error explicitly to avoid divide-by-zero.
Fixes the following warning:
drivers/pwm/pwm-mediatek.o: warning: objtool: .text: unexpected end of section
[ukleinek: s/CONFIGCLK/CONFIGHAVE_CLK/]