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From: Chen Anqing <chenanqing@oppo.com>
To: Ilya Dryomov <idryomov@gmail.com>
Cc: Jeff Layton <jlayton@kernel.org>,
        Sage Weil <sage@redhat.com>,
        Jakub Kicinski <kuba@kernel.org>,
        ceph-devel@vger.kernel.org,
        netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        chenanqing@oppo.com
Subject: [PATCH] libceph: we should take compound page into account also
Date: Fri, 27 Mar 2020 04:36:30 -0400
Message-Id: <20200327083630.36296-1-chenanqing@oppo.com>
X-Mailer: git-send-email 2.18.2

the patch is occur at a real crash,which slab is
come from a compound page,so we need take the compound page
into account also.
fixed commit 7e241f647dc7 ("libceph: fall back to sendmsg for slab pages")'

Signed-off-by: Chen Anqing <chenanqing@oppo.com>
---
 net/ceph/messenger.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index f8ca5edc5f2c..e08c1c334cd9 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -582,7 +582,7 @@ static int ceph_tcp_sendpage(struct socket *sock, struc=
t page *page,
         * coalescing neighboring slab objects into a single frag which
         * triggers one of hardened usercopy checks.
         */
-       if (page_count(page) >=3D 1 && !PageSlab(page))
+       if (page_count(page) >=3D 1 && !PageSlab(compound_head(page)))
                sendpage =3D sock->ops->sendpage;
        else
                sendpage =3D sock_no_sendpage;
--
2.18.2

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