Re: [PATCH] cpufreq: dt: fix oops on armada37xx

[Andrew Lunn]

On Sat, Jun 20, 2020 at 05:44:49PM +0100, Ivan Kokshaysky wrote:
> Commit 0c868627e617e43a295d8 (cpufreq: dt: Allow platform specific
> intermediate callbacks) added two function pointers to the
> struct cpufreq_dt_platform_data. However, armada37xx_cpufreq_driver_init()
> has this struct (pdata) located on the stack and uses only "suspend"
> and "resume" fields. So these newly added "get_intermediate" and
> "target_intermediate" pointers are uninitialized and contain arbitrary
> non-null values, causing all kinds of trouble.
> 
> For instance, here is an oops on espressobin after an attempt to change
> the cpefreq governor:
> 
> [   29.174554] Unable to handle kernel execute from non-executable memory at virtual address ffff00003f87bdc0
> ...
> [   29.269373] pc : 0xffff00003f87bdc0
> [   29.272957] lr : __cpufreq_driver_target+0x138/0x580
> ...
> 
> Fixed by zeroing out pdata before use.
> 
> Signed-off-by: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>

Hi Ivan

A Fixes: tag would be good.

Reviewed-by: Andrew Lunn <andrew@xxxxxxx>

    Andrew