| Message ID | 20201223074849.1989-1-michael.kao@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Daniel Lezcano |
| Headers | show |
| Series | thermal: cpufreq_cooling: fix slab OOB issue | expand |
On 12/23/20 7:48 AM, Michael Kao wrote: > From: brian-sy yang <brian-sy.yang@mediatek.com> > > Slab OOB issue is scanned by KASAN in cpu_power_to_freq(). > If power is limited below the power of OPP0 in EM table, > it will cause slab out-of-bound issue with negative array > index. > > Return the lowest frequency if limited power cannot found > a suitable OPP in EM table to fix this issue. > > Backtrace: > [<ffffffd02d2a37f0>] die+0x104/0x5ac > [<ffffffd02d2a5630>] bug_handler+0x64/0xd0 > [<ffffffd02d288ce4>] brk_handler+0x160/0x258 > [<ffffffd02d281e5c>] do_debug_exception+0x248/0x3f0 > [<ffffffd02d284488>] el1_dbg+0x14/0xbc > [<ffffffd02d75d1d4>] __kasan_report+0x1dc/0x1e0 > [<ffffffd02d75c2e0>] kasan_report+0x10/0x20 > [<ffffffd02d75def8>] __asan_report_load8_noabort+0x18/0x28 > [<ffffffd02e6fce5c>] cpufreq_power2state+0x180/0x43c > [<ffffffd02e6ead80>] power_actor_set_power+0x114/0x1d4 > [<ffffffd02e6fac24>] allocate_power+0xaec/0xde0 > [<ffffffd02e6f9f80>] power_allocator_throttle+0x3ec/0x5a4 > [<ffffffd02e6ea888>] handle_thermal_trip+0x160/0x294 > [<ffffffd02e6edd08>] thermal_zone_device_check+0xe4/0x154 > [<ffffffd02d351cb4>] process_one_work+0x5e4/0xe28 > [<ffffffd02d352f44>] worker_thread+0xa4c/0xfac > [<ffffffd02d360124>] kthread+0x33c/0x358 > [<ffffffd02d289940>] ret_from_fork+0xc/0x18 Thank you for looking at this and sending a fix. It's worth to add the 'fixes' line: Fixes: 371a3bc79c11b ("thermal/drivers/cpufreq_cooling: Fix wrong frequency converted from power") IIRC that patch was sent to stable trees. Might be worth to check and apply this fix. > > Signed-off-by: brian-sy yang <brian-sy.yang@mediatek.com> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> > --- > drivers/thermal/cpufreq_cooling.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c > index cc2959f22f01..fb33b3480a8f 100644 > --- a/drivers/thermal/cpufreq_cooling.c > +++ b/drivers/thermal/cpufreq_cooling.c > @@ -123,7 +123,7 @@ static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, > { > int i; > > - for (i = cpufreq_cdev->max_level; i >= 0; i--) { > + for (i = cpufreq_cdev->max_level; i > 0; i--) { > if (power >= cpufreq_cdev->em->table[i].power) > break; > } >
diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c index cc2959f22f01..fb33b3480a8f 100644 --- a/drivers/thermal/cpufreq_cooling.c +++ b/drivers/thermal/cpufreq_cooling.c @@ -123,7 +123,7 @@ static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, { int i; - for (i = cpufreq_cdev->max_level; i >= 0; i--) { + for (i = cpufreq_cdev->max_level; i > 0; i--) { if (power >= cpufreq_cdev->em->table[i].power) break; }