> -----Original Message----- > From: Poosa, Karthik <karthik.poosa@xxxxxxxxx> > Sent: Friday, December 1, 2023 10:28 AM > To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx > Cc: Gupta, Anshuman <anshuman.gupta@xxxxxxxxx>; Nilawar, Badal > <badal.nilawar@xxxxxxxxx>; Poosa, Karthik <karthik.poosa@xxxxxxxxx> > Subject: [PATCH] drm/i915/hwmon: Fix static analysis tool errors in i915 > hwmon > > Updated i915 hwmon with fixes for issues reported by static analysis tool. > Fixed unintentional buffer overflow (OVERFLOW_BEFORE_WIDEN) with > upcasting. > > v2: Updated commit message with details of issue [Jani]. > > Signed-off-by: Karthik Poosa <karthik.poosa@xxxxxxxxx> Reviewed-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx> > --- > drivers/gpu/drm/i915/i915_hwmon.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_hwmon.c > b/drivers/gpu/drm/i915/i915_hwmon.c > index 975da8e7f2a9..8c3f443c8347 100644 > --- a/drivers/gpu/drm/i915/i915_hwmon.c > +++ b/drivers/gpu/drm/i915/i915_hwmon.c > @@ -175,7 +175,7 @@ hwm_power1_max_interval_show(struct device > *dev, struct device_attribute *attr, > * tau4 = (4 | x) << y > * but add 2 when doing the final right shift to account for units > */ > - tau4 = ((1 << x_w) | x) << y; > + tau4 = (u64)((1 << x_w) | x) << y; > /* val in hwmon interface units (millisec) */ > out = mul_u64_u32_shr(tau4, SF_TIME, hwmon->scl_shift_time + > x_w); > > @@ -211,7 +211,7 @@ hwm_power1_max_interval_store(struct device > *dev, > r = FIELD_PREP(PKG_MAX_WIN, PKG_MAX_WIN_DEFAULT); > x = REG_FIELD_GET(PKG_MAX_WIN_X, r); > y = REG_FIELD_GET(PKG_MAX_WIN_Y, r); > - tau4 = ((1 << x_w) | x) << y; > + tau4 = (u64)((1 << x_w) | x) << y; > max_win = mul_u64_u32_shr(tau4, SF_TIME, hwmon->scl_shift_time > + x_w); > > if (val > max_win) > -- > 2.25.1
