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| author | Ian Campbell <Ian.Campbell@citrix.com> | 2013-02-07 03:41:37 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-08 08:29:28 +0400 |
| commit | 4cc7c1cb7b11b6f3515bd9075527576a1eecc4aa (patch) | |
| tree | ebc40008ce01364f4925b82bec1fa13389eb7703 | |
| parent | 7d5145d8eb2b9791533ffe4dc003b129b9696c48 (diff) | |
| download | linux-4cc7c1cb7b11b6f3515bd9075527576a1eecc4aa.tar.xz | |
xen/netback: free already allocated memory on failure in xen_netbk_get_requests
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/xen-netback/netback.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index bf692df966a9..dcb2d4d3c3ea 100644 --- 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_requests(struct xen_netbk *netbk, 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_requests(struct xen_netbk *netbk, } 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, |