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xen/netback: free already allocated memory on failure in xen_netbk_get_requests

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[ Upstream commit 4cc7c1cb7b ]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Campbell
2013-02-06 23:41:37 +00:00
committed by Greg Kroah-Hartman
parent f0457844e6
commit 1d08d86d53
1 changed files with 12 additions and 1 deletions
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13
drivers/net/xen-netback/netback.c
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@@ -937,7 +937,7 @@ 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;
netbk->mmap_pages[pending_idx] = page;
@@ -961,6 +961,17 @@ 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, (unsigned long)shinfo->frags[i].page,
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,