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From:   gregory.greenman@intel.com
To:     johannes@sipsolutions.net
Cc:     linux-wireless@vger.kernel.org,
        Mukesh Sisodiya <mukesh.sisodiya@intel.com>,
        Gregory Greenman <gregory.greenman@intel.com>
Subject: [PATCH 08/15] wifi: iwlwifi: mvm: Add NULL check before dereferencing the pointer
Date:   Mon, 12 Jun 2023 18:51:09 +0300
Message-Id: <20230612184434.cf7a5ce82fb0.Id3c05d13eeee6638f0930f750e93fb928d5c9dee@changeid>
In-Reply-To: <20230612155116.168000-1-gregory.greenman@intel.com>
References: <20230612155116.168000-1-gregory.greenman@intel.com>
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From: Mukesh Sisodiya <mukesh.sisodiya@intel.com>

The p2p, bss and ap vif pointers are assigned based on the mode.
All pointers will not have valid value at same time and can be
NULL, based on configured mode. This can lead to NULL pointer
access. Add NULL pointer check before accessing the data from
vif pointer.

Signed-off-by: Mukesh Sisodiya <mukesh.sisodiya@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/power.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/power.c b/drivers/net/wireless/intel/iwlwifi/mvm/power.c
index ac1dae52556f..19839cc44eb3 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/power.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/power.c
@@ -647,30 +647,32 @@ static void iwl_mvm_power_set_pm(struct iwl_mvm *mvm,
 		return;
 
 	/* enable PM on bss if bss stand alone */
-	if (vifs->bss_active && !vifs->p2p_active && !vifs->ap_active) {
+	if (bss_mvmvif && vifs->bss_active && !vifs->p2p_active &&
+	    !vifs->ap_active) {
 		bss_mvmvif->pm_enabled = true;
 		return;
 	}
 
 	/* enable PM on p2p if p2p stand alone */
-	if (vifs->p2p_active && !vifs->bss_active && !vifs->ap_active) {
+	if (p2p_mvmvif && vifs->p2p_active && !vifs->bss_active &&
+	    !vifs->ap_active) {
 		p2p_mvmvif->pm_enabled = true;
 		return;
 	}
 
-	if (vifs->bss_active && vifs->p2p_active)
+	if (p2p_mvmvif && bss_mvmvif && vifs->bss_active && vifs->p2p_active)
 		client_same_channel =
 			iwl_mvm_have_links_same_channel(bss_mvmvif, p2p_mvmvif);
 
-	if (vifs->bss_active && vifs->ap_active)
+	if (bss_mvmvif && ap_mvmvif && vifs->bss_active && vifs->ap_active)
 		ap_same_channel =
 			iwl_mvm_have_links_same_channel(bss_mvmvif, ap_mvmvif);
 
 	/* clients are not stand alone: enable PM if DCM */
 	if (!(client_same_channel || ap_same_channel)) {
-		if (vifs->bss_active)
+		if (bss_mvmvif && vifs->bss_active)
 			bss_mvmvif->pm_enabled = true;
-		if (vifs->p2p_active)
+		if (p2p_mvmvif && vifs->p2p_active)
 			p2p_mvmvif->pm_enabled = true;
 		return;
 	}
-- 
2.38.1