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xen-netback: respect gnttab_map_refs()'s return value

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Commit 3194a1746e8a ("xen-netback: don't "handle" error by BUG()")
dropped respective a BUG_ON() without noticing that with this the
variable's value wouldn't be consumed anymore. With gnttab_set_map_op()
setting all status fields to a non-zero value, in case of an error no
slot should have a status of GNTST_okay (zero).

This is part of XSA-367.

Cc: <stable@vger.kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/d933f495-619a-0086-5fb4-1ec3cf81a8fc@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Jan Beulich 2021-02-25 16:35:15 +01:00 committed by Juergen Gross
parent 8310b77b48
commit 2991397d23
1 changed files with 11 additions and 1 deletions
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12
drivers/net/xen-netback/netback.c
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@ -1343,11 +1343,21 @@ int xenvif_tx_action(struct xenvif_queue *queue, int budget)
return 0;
gnttab_batch_copy(queue->tx_copy_ops, nr_cops);
if (nr_mops != 0)
if (nr_mops != 0) {
ret = gnttab_map_refs(queue->tx_map_ops,
NULL,
queue->pages_to_map,
nr_mops);
if (ret) {
unsigned int i;
netdev_err(queue->vif->dev, "Map fail: nr %u ret %d\n",
nr_mops, ret);
for (i = 0; i < nr_mops; ++i)
WARN_ON_ONCE(queue->tx_map_ops[i].status ==
GNTST_okay);
}
}
work_done = xenvif_tx_submit(queue);