From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ian Campbell , "David S. Miller" Subject: [ 41/61] xen/netback: free already allocated memory on failure in xen_netbk_get_requests Date: Tue, 12 Feb 2013 12:35:01 -0800 Message-Id: <20130212203423.655566370@linuxfoundation.org> In-Reply-To: <20130212203417.890993903@linuxfoundation.org> References: <20130212203417.890993903@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ian Campbell [ Upstream commit 4cc7c1cb7b11b6f3515bd9075527576a1eecc4aa ] Signed-off-by: Ian Campbell Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/xen-netback/netback.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -978,7 +978,7 @@ static struct gnttab_copy *xen_netbk_get pending_idx = netbk->pending_ring[index]; page = xen_netbk_alloc_page(netbk, skb, pending_idx); if (!page) - return NULL; + goto err; gop->source.u.ref = txp->gref; gop->source.domid = vif->domid; @@ -1000,6 +1000,17 @@ static struct gnttab_copy *xen_netbk_get } return gop; +err: + /* Unwind, freeing all pages and sending error responses. */ + while (i-- > start) { + xen_netbk_idx_release(netbk, frag_get_pending_idx(&frags[i]), + XEN_NETIF_RSP_ERROR); + } + /* The head too, if necessary. */ + if (start) + xen_netbk_idx_release(netbk, pending_idx, XEN_NETIF_RSP_ERROR); + + return NULL; } static int xen_netbk_tx_check_gop(struct xen_netbk *netbk,