From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 90E2D6FBB for ; Tue, 10 Jan 2023 18:29:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 05737C433D2; Tue, 10 Jan 2023 18:29:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673375364; bh=AipgWh0lSkZV+fTw1vScQ4PtoBkZ3hoHnYYd+w57pTg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z7fwueUkv3evavqn4KFVtvxrh/1BQ+9LA1wXxEYEZRF+2pKqQNI7zefZ4qFAH8AGT VW7Zz9GyPHx2+/hbAP1gaiU7AERGWplZJwhnzG4S3o6qnQLvvZ6YTlkjxK3xt0qF4+ CsOz6/pjOV2xi/xQ6xC9Fz0JkVfcszu3Fd4egr88= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shang XiaoJing , Helge Deller Subject: [PATCH 5.15 133/290] parisc: led: Fix potential null-ptr-deref in start_task() Date: Tue, 10 Jan 2023 19:03:45 +0100 Message-Id: <20230110180036.423468169@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230110180031.620810905@linuxfoundation.org> References: <20230110180031.620810905@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Shang XiaoJing commit 41f563ab3c33698bdfc3403c7c2e6c94e73681e4 upstream. start_task() calls create_singlethread_workqueue() and not checked the ret value, which may return NULL. And a null-ptr-deref may happen: start_task() create_singlethread_workqueue() # failed, led_wq is NULL queue_delayed_work() queue_delayed_work_on() __queue_delayed_work() # warning here, but continue __queue_work() # access wq->flags, null-ptr-deref Check the ret value and return -ENOMEM if it is NULL. Fixes: 3499495205a6 ("[PARISC] Use work queue in LED/LCD driver instead of tasklet.") Signed-off-by: Shang XiaoJing Signed-off-by: Helge Deller Cc: Signed-off-by: Greg Kroah-Hartman --- drivers/parisc/led.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/parisc/led.c +++ b/drivers/parisc/led.c @@ -137,6 +137,9 @@ static int start_task(void) /* Create the work queue and queue the LED task */ led_wq = create_singlethread_workqueue("led_wq"); + if (!led_wq) + return -ENOMEM; + queue_delayed_work(led_wq, &led_task, 0); return 0;