From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9F305C433F5 for ; Tue, 9 Nov 2021 01:24:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 88CBA610A8 for ; Tue, 9 Nov 2021 01:24:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243233AbhKIB1B (ORCPT ); Mon, 8 Nov 2021 20:27:01 -0500 Received: from mail.kernel.org ([198.145.29.99]:49932 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242638AbhKIBXI (ORCPT ); Mon, 8 Nov 2021 20:23:08 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8FDE561B28; Tue, 9 Nov 2021 01:08:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1636420122; bh=AEtsryqMgiz7txJQbTtIKhhazF22c3vMUYB4VyAzqyU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WR4rMqVb9wg+i8y2cWmSnPvw7zU+q8EwHYB5UsihoDSDWllIXZfihhiW4uEt82Dw1 65m00kwTL42mcI8TCQ5xTmWcK8sNnLpY7s3GCGs0No32we87pTviE6vLyeZRj/EcIV CDe1q+YJYf0mqYtcW3QCloTPZN4xNTYGTgY5c1WvzkC6JlDd+jvr594nXKdg2rQin8 vfC53Libm+TLw4v4qP7PyGER0Z5fL46sAV+NB2tHp5jojdSucZeLShGDZC9DPJVBxe lTyP+zlC8oDwPlWdyccuTraQ7Mmz9O9s6ryGdvk2DOVQiV179YSkT9lo0ok9bQ28D3 5G271QiAHPvXQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Tuo Li , TOTE Robot , Kalle Valo , Sasha Levin , davem@davemloft.net, kuba@kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 19/33] ath: dfs_pattern_detector: Fix possible null-pointer dereference in channel_detector_create() Date: Mon, 8 Nov 2021 20:07:53 -0500 Message-Id: <20211109010807.1191567-19-sashal@kernel.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211109010807.1191567-1-sashal@kernel.org> References: <20211109010807.1191567-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Tuo Li [ 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 Signed-off-by: Tuo Li Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20210805153854.154066-1-islituo@gmail.com Signed-off-by: Sasha Levin --- 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 78146607f16e8..acd85e5069346 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