Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752662Ab3F1TQy (ORCPT ); Fri, 28 Jun 2013 15:16:54 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:41609 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752265Ab3F1SyB (ORCPT ); Fri, 28 Jun 2013 14:54:01 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Eric Dumazet , Bernhard Beck , "David S. Miller" , Kamal Mostafa Subject: [PATCH 065/105] tcp: fix tcp_md5_hash_skb_data() Date: Fri, 28 Jun 2013 11:51:27 -0700 Message-Id: <1372445527-24414-66-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1372445527-24414-1-git-send-email-kamal@canonical.com> References: <1372445527-24414-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1882 Lines: 56 3.8.13.4 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit 54d27fcb338bd9c42d1dfc5a39e18f6f9d373c2e ] TCP md5 communications fail [1] for some devices, because sg/crypto code assume page offsets are below PAGE_SIZE. This was discovered using mlx4 driver [2], but I suspect loopback might trigger the same bug now we use order-3 pages in tcp_sendmsg() [1] Failure is giving following messages. huh, entered softirq 3 NET_RX ffffffff806ad230 preempt_count 00000100, exited with 00000101? [2] mlx4 driver uses order-2 pages to allocate RX frags Reported-by: Matt Schnall Signed-off-by: Eric Dumazet Cc: Bernhard Beck Signed-off-by: David S. Miller Signed-off-by: Kamal Mostafa --- net/ipv4/tcp.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 45b63ca..425058e 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3371,8 +3371,11 @@ int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp, for (i = 0; i < shi->nr_frags; ++i) { const struct skb_frag_struct *f = &shi->frags[i]; - struct page *page = skb_frag_page(f); - sg_set_page(&sg, page, skb_frag_size(f), f->page_offset); + unsigned int offset = f->page_offset; + struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT); + + sg_set_page(&sg, page, skb_frag_size(f), + offset_in_page(offset)); if (crypto_hash_update(desc, &sg, skb_frag_size(f))) return 1; } -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/