2021-06-12 14:38:46

by John Wood

Subject: [PATCH] mt76/mt7915: Fix unsigned compared against zero

The mt7915_dpd_freq_idx() function can return a negative value but this
value is assigned to an unsigned variable named idx. Then, the code
tests if this variable is less than zero. This can never happen with an
unsigned type.

So, change the idx type to a signed one.

Addresses-Coverity-ID: 1484753 ("Unsigned compared against 0")
Fixes: 495184ac91bb8 ("mt76: mt7915: add support for applying pre-calibration data")
Signed-off-by: John Wood <[email protected]>
---
drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index b3f14ff67c5a..764f25a828fa 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -3440,8 +3440,9 @@ int mt7915_mcu_apply_tx_dpd(struct mt7915_phy *phy)
{
struct mt7915_dev *dev = phy->dev;
struct cfg80211_chan_def *chandef = &phy->mt76->chandef;
- u16 total = 2, idx, center_freq = chandef->center_freq1;
+ u16 total = 2, center_freq = chandef->center_freq1;
u8 *cal = dev->cal, *eep = dev->mt76.eeprom.data;
+ int idx;

if (!(eep[MT_EE_DO_PRE_CAL] & MT_EE_WIFI_CAL_DPD))
return 0;
--
2.25.1

2021-06-26 14:31:31

by John Wood

Subject: Re: [PATCH] mt76/mt7915: Fix unsigned compared against zero

On Sat, Jun 12, 2021 at 04:35:05PM +0200, John Wood wrote:
> The mt7915_dpd_freq_idx() function can return a negative value but this
> value is assigned to an unsigned variable named idx. Then, the code
> tests if this variable is less than zero. This can never happen with an
> unsigned type.
>
> So, change the idx type to a signed one.
>
> Addresses-Coverity-ID: 1484753 ("Unsigned compared against 0")
> Fixes: 495184ac91bb8 ("mt76: mt7915: add support for applying pre-calibration data")

Has anyone had time to review this patch?. Any comment on this?

Thanks,
John Wood