linux-kernel - [PATCH 4.18 031/135] tun: initialize napi

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Message-Id: <20181016170517.200157017@linuxfoundation.org>
Date:   Tue, 16 Oct 2018 19:04:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        syzbot+e662df0ac1d753b57e80@...kaller.appspotmail.com,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.18 031/135] tun: initialize napi_mutex unconditionally

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit c7256f579f8302ce2c038181c30060d0b40017b2 ]

This is the first part to fix following syzbot report :

console output: https://syzkaller.appspot.com/x/log.txt?x=145378e6400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=443816db871edd66
dashboard link: https://syzkaller.appspot.com/bug?extid=e662df0ac1d753b57e80

Following patch is fixing the race condition, but it seems safer
to initialize this mutex at tfile creation anyway.

Fixes: 90e33d459407 ("tun: enable napi_gro_frags() for TUN/TAP driver")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: syzbot+e662df0ac1d753b57e80@...kaller.appspotmail.com
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/tun.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -319,7 +319,6 @@ static void tun_napi_init(struct tun_str
 		netif_napi_add(tun->dev, &tfile->napi, tun_napi_poll,
 			       NAPI_POLL_WEIGHT);
 		napi_enable(&tfile->napi);
-		mutex_init(&tfile->napi_mutex);
 	}
 }
 
@@ -3241,6 +3240,7 @@ static int tun_chr_open(struct inode *in
 		return -ENOMEM;
 	}
 
+	mutex_init(&tfile->napi_mutex);
 	RCU_INIT_POINTER(tfile->tun, NULL);
 	tfile->flags = 0;
 	tfile->ifindex = 0;