linux-kernel - Re: WARNING in ath6kl_htc_pipe_rx

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Date:   Tue, 19 Nov 2019 14:35:53 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     syzbot <syzbot+555908813b2ea35dae9a@...kaller.appspotmail.com>,
        andreyknvl@...gle.com, davem@...emloft.net, kvalo@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in ath6kl_htc_pipe_rx_complete

Am Donnerstag, den 07.11.2019, 07:34 -0800 schrieb syzbot:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    d60bbfea usb: raw: add raw-gadget interface
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=1029829ae00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=79de80330003b5f7
> dashboard link: https://syzkaller.appspot.com/bug?extid=555908813b2ea35dae9a
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1388a2aae00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13aa35dce00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+555908813b2ea35dae9a@...kaller.appspotmail.com

#syz test: https://github.com/google/kasan.git d60bbfea

>From d289a4973b869117a5a7f70297b0cecffceb8289 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@...e.com>
Date: Mon, 18 Nov 2019 19:23:25 +0100
Subject: [PATCH] ath6kl: reduce WARN to dev_dbg() in callback

The warn is triggered on a known race condition
that is correctly handled. Using WARN() hinders automated
testing. Reducing severity.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
---
 drivers/net/wireless/ath/ath6kl/htc_pipe.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath6kl/htc_pipe.c b/drivers/net/wireless/ath/ath6kl/htc_pipe.c
index c68848819a52..9b88d96bfe96 100644
--- a/drivers/net/wireless/ath/ath6kl/htc_pipe.c
+++ b/drivers/net/wireless/ath/ath6kl/htc_pipe.c
@@ -960,8 +960,8 @@ static int ath6kl_htc_pipe_rx_complete(struct ath6kl *ar, struct sk_buff *skb,
 	 * Thus the possibility of ar->htc_target being NULL
 	 * via ath6kl_recv_complete -> ath6kl_usb_io_comp_work.
 	 */
-	if (WARN_ON_ONCE(!target)) {
-		ath6kl_err("Target not yet initialized\n");
+	if (!target) {
+		ath6kl_dbg(ATH6KL_DBG_HTC, "Target not yet initialized\n");
 		status = -EINVAL;
 		goto free_skb;
 	}
-- 
2.16.4