linux-kernel - [PATCH AUTOSEL 4.4 18/30] ath: dfs_pattern_detector: Fix possible null-pointer dereference in channel_detector

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Message-Id: <20211109010918.1192063-18-sashal@kernel.org>
Date:   Mon,  8 Nov 2021 20:09:06 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tuo Li <islituo@...il.com>, TOTE Robot <oslab@...nghua.edu.cn>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
        kuba@...nel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 18/30] ath: dfs_pattern_detector: Fix possible null-pointer dereference in channel_detector_create()

From: Tuo Li <islituo@...il.com>

[ Upstream commit 4b6012a7830b813799a7faf40daa02a837e0fd5b ]

kzalloc() is used to allocate memory for cd->detectors, and if it fails,
channel_detector_exit() behind the label fail will be called:
  channel_detector_exit(dpd, cd);

In channel_detector_exit(), cd->detectors is dereferenced through:
  struct pri_detector *de = cd->detectors[i];

To fix this possible null-pointer dereference, check cd->detectors before
the for loop to dereference cd->detectors.

Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Tuo Li <islituo@...il.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/20210805153854.154066-1-islituo@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/dfs_pattern_detector.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/dfs_pattern_detector.c b/drivers/net/wireless/ath/dfs_pattern_detector.c
index 0835828ffed77..2f4b79102a27a 100644
--- a/drivers/net/wireless/ath/dfs_pattern_detector.c
+++ b/drivers/net/wireless/ath/dfs_pattern_detector.c
@@ -182,10 +182,12 @@ static void channel_detector_exit(struct dfs_pattern_detector *dpd,
 	if (cd == NULL)
 		return;
 	list_del(&cd->head);
-	for (i = 0; i < dpd->num_radar_types; i++) {
-		struct pri_detector *de = cd->detectors[i];
-		if (de != NULL)
-			de->exit(de);
+	if (cd->detectors) {
+		for (i = 0; i < dpd->num_radar_types; i++) {
+			struct pri_detector *de = cd->detectors[i];
+			if (de != NULL)
+				de->exit(de);
+		}
 	}
 	kfree(cd->detectors);
 	kfree(cd);
-- 
2.33.0