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authorJan Beulich <jbeulich@suse.com>2021-02-15 08:54:51 +0100
committerJuergen Gross <jgross@suse.com>2021-02-15 08:54:51 +0100
commit5a264285ed1cd32e26d9de4f3c8c6855e467fd63 (patch)
treeee227644c73154ac46969aee369f79705603b2dd /drivers/block
parent36bf1dfb8b266e089afa9b7b984217f17027bf35 (diff)
xen-blkback: don't "handle" error by BUG()
In particular -ENOMEM may come back here, from set_foreign_p2m_mapping(). Don't make problems worse, the more that handling elsewhere (together with map's status fields now indicating whether a mapping wasn't even attempted, and hence has to be considered failed) doesn't require this odd way of dealing with errors. This is part of XSA-362. Signed-off-by: Jan Beulich <jbeulich@suse.com> Cc: stable@vger.kernel.org Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/xen-blkback/blkback.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 9ebf53903d7b..ee62b3c0b55a 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -811,10 +811,8 @@ again:
break;
}
- if (segs_to_map) {
+ if (segs_to_map)
ret = gnttab_map_refs(map, NULL, pages_to_gnt, segs_to_map);
- BUG_ON(ret);
- }
/*
* Now swizzle the MFN in our domain with the MFN from the other domain
@@ -830,7 +828,7 @@ again:
gnttab_page_cache_put(&ring->free_pages,
&pages[seg_idx]->page, 1);
pages[seg_idx]->handle = BLKBACK_INVALID_HANDLE;
- ret |= 1;
+ ret |= !ret;
goto next;
}
pages[seg_idx]->handle = map[new_map_idx].handle;