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Avoid some crashes when importing a pool with corrupt metadata #9022

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Dec 26, 2019
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Avoid some crashes when importing a pool with corrupt metadata #9022

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14 changes: 11 additions & 3 deletions module/zfs/vdev_mirror.c
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Original file line number Diff line number Diff line change
Expand Up @@ -282,10 +282,11 @@ vdev_mirror_map_init(zio_t *zio)
}

/*
* If we do not trust the pool config, some DVAs might be
* invalid or point to vdevs that do not exist. We skip them.
* If the pool cannot be written to, then infer that some
* DVAs might be invalid or point to vdevs that do not exist.
* We skip them.
*/
if (!spa_trust_config(spa)) {
if (!spa_writeable(spa)) {
ASSERT3U(zio->io_type, ==, ZIO_TYPE_READ);
int j = 0;
for (int i = 0; i < c; i++) {
Expand All @@ -309,6 +310,13 @@ vdev_mirror_map_init(zio_t *zio)

mc->mc_vd = vdev_lookup_top(spa, DVA_GET_VDEV(&dva[c]));
mc->mc_offset = DVA_GET_OFFSET(&dva[c]);
if (mc->mc_vd == NULL) {
kmem_free(mm, vdev_mirror_map_size(
mm->mm_children));
zio->io_vsd = NULL;
zio->io_error = ENXIO;
return (NULL);
}
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}
} else {
/*
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