From: Eric Dumazet Date: Wed, 22 Jan 2020 17:07:35 +0000 (-0800) Subject: tun: add mutex_unlock() call and napi.skb clearing in tun_get_user() X-Git-Tag: v4.19.100~72 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8f50a05dd6fe2372ac0d5c67645e4e480254ce30;p=platform%2Fkernel%2Flinux-rpi.git tun: add mutex_unlock() call and napi.skb clearing in tun_get_user() [ Upstream commit 1efba987c48629c0c64703bb4ea76ca1a3771d17 ] If both IFF_NAPI_FRAGS mode and XDP are enabled, and the XDP program consumes the skb, we need to clear the napi.skb (or risk a use-after-free) and release the mutex (or risk a deadlock) WARNING: lock held when returning to user space! 5.5.0-rc6-syzkaller #0 Not tainted ------------------------------------------------ syz-executor.0/455 is leaving the kernel with locks still held! 1 lock held by syz-executor.0/455: #0: ffff888098f6e748 (&tfile->napi_mutex){+.+.}, at: tun_get_user+0x1604/0x3fc0 drivers/net/tun.c:1835 Fixes: 90e33d459407 ("tun: enable napi_gro_frags() for TUN/TAP driver") Signed-off-by: Eric Dumazet Reported-by: syzbot Cc: Petar Penkov Cc: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/tun.c b/drivers/net/tun.c index bbd9222..09c444d 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1900,6 +1900,10 @@ drop: if (ret != XDP_PASS) { rcu_read_unlock(); local_bh_enable(); + if (frags) { + tfile->napi.skb = NULL; + mutex_unlock(&tfile->napi_mutex); + } return total_len; } }