diff options
author | Seth Forshee <seth.forshee@canonical.com> | 2014-11-25 20:28:24 -0600 |
---|---|---|
committer | Jiri Slaby <jslaby@suse.cz> | 2015-01-06 13:59:53 +0100 |
commit | 7493962219d95121cf95214db07df51373020363 (patch) | |
tree | b658ca2b1e6cd6031ad2458d43f3ea75d3639c58 | |
parent | 6f6204584a51a9c36732d289cc037c256208b20e (diff) |
xen-netfront: Remove BUGs on paged skb data which crosses a page boundary
[ Upstream commit 8d609725d4357f499e2103e46011308b32f53513 ]
These BUGs can be erroneously triggered by frags which refer to
tail pages within a compound page. The data in these pages may
overrun the hardware page while still being contained within the
compound page, but since compound_order() evaluates to 0 for tail
pages the assertion fails. The code already iterates through
subsequent pages correctly in this scenario, so the BUGs are
unnecessary and can be removed.
Fixes: f36c374782e4 ("xen/netfront: handle compound page fragments on transmit")
Cc: <stable@vger.kernel.org> # 3.7+
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
-rw-r--r-- | drivers/net/xen-netfront.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index 7c541dc1647e..fd3c1da14495 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -468,9 +468,6 @@ static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, len = skb_frag_size(frag); offset = frag->page_offset; - /* Data must not cross a page boundary. */ - BUG_ON(len + offset > PAGE_SIZE<<compound_order(page)); - /* Skip unused frames from start of page */ page += offset >> PAGE_SHIFT; offset &= ~PAGE_MASK; @@ -478,8 +475,6 @@ static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, while (len > 0) { unsigned long bytes; - BUG_ON(offset >= PAGE_SIZE); - bytes = PAGE_SIZE - offset; if (bytes > len) bytes = len; |