ath11k: fix a double free and a memory leak

clang static analyzer reports this problem

mac.c:6204:2: warning: Attempt to free released memory
        kfree(ar->mac.sbands[NL80211_BAND_2GHZ].channels);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The channels pointer is allocated in ath11k_mac_setup_channels_rates()
When it fails midway, it cleans up the memory it has already allocated.
So the error handling needs to skip freeing the memory.

There is a second problem.
ath11k_mac_setup_channels_rates(), allocates 3 channels. err_free
misses releasing ar->mac.sbands[NL80211_BAND_6GHZ].channels

Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200906212625.17059-1-trix@redhat.com

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index f4a085baff38ed5d8baefc0d7b792765d822c23f..e107a52b16201d4fa5115bc553eee0c3ae07af3b 100644 (file)
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -6089,7 +6089,7 @@ static int __ath11k_mac_register(struct ath11k *ar)
        ret = ath11k_mac_setup_channels_rates(ar,
                                              cap->supported_bands);
        if (ret)
-               goto err_free;
+               goto err;
 
        ath11k_mac_setup_ht_vht_cap(ar, cap, &ht_cap);
        ath11k_mac_setup_he_cap(ar, cap);
@@ -6203,7 +6203,9 @@ static int __ath11k_mac_register(struct ath11k *ar)
 err_free:
        kfree(ar->mac.sbands[NL80211_BAND_2GHZ].channels);
        kfree(ar->mac.sbands[NL80211_BAND_5GHZ].channels);
+       kfree(ar->mac.sbands[NL80211_BAND_6GHZ].channels);
 
+err:
        SET_IEEE80211_DEV(ar->hw, NULL);
        return ret;
 }