mt76: mt7915: fix possible NULL pointer dereference in mt7915_mac_fill_rx_vector

Fix possible NULL pointer dereference in mt7915_mac_fill_rx_vector
routine if the chip does not support dbdc and the hw reports band_idx
set to 1.

Fixes: 78fc30a21cf11 ("mt76: mt7915: move testmode data from dev to phy")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 957895f..4f538ca 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -864,8 +864,11 @@ mt7915_mac_fill_rx_vector(struct mt7915_dev *dev, struct sk_buff *skb)
        int i;
 
        band_idx = le32_get_bits(rxv_hdr[1], MT_RXV_HDR_BAND_IDX);
-       if (band_idx && !phy->band_idx)
+       if (band_idx && !phy->band_idx) {
                phy = mt7915_ext_phy(dev);
+               if (!phy)
+                       goto out;
+       }
 
        rcpi = le32_to_cpu(rxv[6]);
        ib_rssi = le32_to_cpu(rxv[7]);
@@ -890,8 +893,8 @@ mt7915_mac_fill_rx_vector(struct mt7915_dev *dev, struct sk_buff *skb)
 
        phy->test.last_freq_offset = foe;
        phy->test.last_snr = snr;
+out:
 #endif
-
        dev_kfree_skb(skb);
 }