It is possible to access an element at index -1 if at the first iteration of the loop the result of switch is equal to 0x25 Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Andrey Shumilin <shum.sdl@xxxxxxxx> --- drivers/gpu/drm/nouveau/nvkm/subdev/bios/therm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/therm.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/therm.c index 5babc5a7c7d5..78387053f214 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/therm.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/therm.c @@ -180,6 +180,8 @@ nvbios_therm_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan) cur_trip->fan_duty = duty_lut[(value & 0xf000) >> 12]; break; case 0x25: + if (fan->nr_fan_trip == 0) + fan->nr_fan_trip++; cur_trip = &fan->trip[fan->nr_fan_trip - 1]; cur_trip->fan_duty = value; break; -- 2.30.2
