linux-kernel - Re: [syzbot] [wireless?] WARNING in rate_control_rate

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Date:   Tue, 28 Nov 2023 20:04:23 -0800
From:   syzbot <syzbot+62d7eef57b09bfebcd84@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [wireless?] WARNING in rate_control_rate_init

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linux-kernel@...r.kernel.org.

***

Subject: [wireless?] WARNING in rate_control_rate_init
Author: eadavis@...com

please test WARNING in rate_control_rate_init

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6e2332e0ab53

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 606b1b2e4123..e97ed85b7723 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1787,22 +1787,12 @@ static int sta_link_apply_parameters(struct ieee80211_local *local,
 		rcu_dereference_protected(sta->link[link_id],
 					  lockdep_is_held(&local->hw.wiphy->mtx));
 
-	/*
-	 * If there are no changes, then accept a link that doesn't exist,
-	 * unless it's a new link.
-	 */
-	if (params->link_id < 0 && !new_link &&
-	    !params->link_mac && !params->txpwr_set &&
-	    !params->supported_rates_len &&
-	    !params->ht_capa && !params->vht_capa &&
-	    !params->he_capa && !params->eht_capa &&
-	    !params->opmode_notif_used)
-		return 0;
-
+	printk("%p, %p, %d\n", link, link_sta, new_link);
 	if (!link || !link_sta)
 		return -EINVAL;
 
 	sband = ieee80211_get_link_sband(link);
+	printk("%p\n", sband);
 	if (!sband)
 		return -EINVAL;
 
@@ -1812,11 +1802,23 @@ static int sta_link_apply_parameters(struct ieee80211_local *local,
 			memcpy(link_sta->pub->addr, params->link_mac, ETH_ALEN);
 		} else if (!ether_addr_equal(link_sta->addr,
 					     params->link_mac)) {
+			printk("%s\n", __func__);
 			return -EINVAL;
 		}
 	} else if (new_link) {
 		return -EINVAL;
 	}
+	/*
+	 * If there are no changes, then accept a link that doesn't exist,
+	 * unless it's a new link.
+	 */
+	if (params->link_id < 0 && !new_link &&
+	    !params->link_mac && !params->txpwr_set &&
+	    !params->supported_rates_len &&
+	    !params->ht_capa && !params->vht_capa &&
+	    !params->he_capa && !params->eht_capa &&
+	    !params->opmode_notif_used)
+		return 0;
 
 	if (params->txpwr_set) {
 		link_sta->pub->txpwr.type = params->txpwr.type;
@@ -1982,6 +1985,10 @@ static int sta_apply_parameters(struct ieee80211_local *local,
 	if (params->listen_interval >= 0)
 		sta->listen_interval = params->listen_interval;
 
+	printk("b, stp: %d, sa: %d, src: %d\n", 
+			test_sta_flag(sta, WLAN_STA_TDLS_PEER), 
+			test_sta_flag(sta, WLAN_STA_ASSOC), 
+			test_sta_flag(sta, WLAN_STA_RATE_CONTROL));
 	ret = sta_link_apply_parameters(local, sta, false,
 					&params->link_sta_params);
 	if (ret)
@@ -1996,6 +2003,10 @@ static int sta_apply_parameters(struct ieee80211_local *local,
 	if (params->airtime_weight)
 		sta->airtime_weight = params->airtime_weight;
 
+	printk("a, stp: %d, sa: %d, src: %d\n", 
+			test_sta_flag(sta, WLAN_STA_TDLS_PEER), 
+			test_sta_flag(sta, WLAN_STA_ASSOC), 
+			test_sta_flag(sta, WLAN_STA_RATE_CONTROL));
 	/* set the STA state after all sta info from usermode has been set */
 	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) ||
 	    set & BIT(NL80211_STA_FLAG_ASSOCIATED)) {