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xen-blkback: fix leak of grant maps on ring setup failure

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Multi page rings are mapped using a single hypercall that gets passed
an array of grants to map. One of the grants in the array failing to
map would lead to the failure of the whole ring setup operation, but
there was no cleanup of the rest of the grant maps in the array that
could have likely been created as a result of the hypercall.

Add proper cleanup on the failure path during ring setup to unmap any
grants that could have been created.

This is part of XSA-361.

Sponsored by:	Citrix Systems R&D
This commit is contained in:
Roger Pau Monné 2021-01-20 19:40:51 +01:00
parent aa8ae5fe17
commit 808d4aad10
1 changed files with 21 additions and 0 deletions
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21
sys/dev/xen/blkback/blkback.c
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@ -2893,10 +2893,31 @@ xbb_connect_ring(struct xbb_softc *xbb)
ring_idx < xbb->ring_config.ring_pages;
ring_idx++, gnt++) {
if (gnt->status != 0) {
struct gnttab_unmap_grant_ref unmap[XBB_MAX_RING_PAGES];
unsigned int i, j;
xbb->ring_config.va = 0;
xenbus_dev_fatal(xbb->dev, EACCES,
"Ring shared page mapping failed. "
"Status %d.", gnt->status);
/* Unmap everything to avoid leaking grant table maps */
for (i = 0, j = 0; i < xbb->ring_config.ring_pages;
i++) {
if (gnts[i].status != GNTST_okay)
continue;
unmap[j].host_addr = gnts[i].host_addr;
unmap[j].dev_bus_addr = gnts[i].dev_bus_addr;
unmap[j++].handle = gnts[i].handle;
}
if (j != 0) {
error = HYPERVISOR_grant_table_op(
GNTTABOP_unmap_grant_ref, unmap, j);
if (error != 0)
panic("Unable to unmap grants (%d)",
error);
}
return (EACCES);
}
xbb->ring_config.handle[ring_idx] = gnt->handle;