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block: Null pointer dereference in blk_root_get_parent_desc()

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The dev_id returned by the call to blk_get_attached_dev_id() in
blk_root_get_parent_desc() can be NULL (an internal call to
object_get_canonical_path may have returned NULL).

Instead of just checking this case before before dereferencing,
adjust blk_get_attached_dev_id() to return the empty string if no
object path can be found (similar to the case when blk->dev is NULL
and an empty string is returned).

Signed-off-by: Liam Merwick <Liam.Merwick@oracle.com>
Message-id: 1541453919-25973-3-git-send-email-Liam.Merwick@oracle.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Liam Merwick 2018-11-05 21:38:36 +00:00 committed by Max Reitz
parent c2032289b0
commit 602414d123
1 changed files with 2 additions and 1 deletions
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3
block/block-backend.c
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@ -918,7 +918,8 @@ char *blk_get_attached_dev_id(BlockBackend *blk)
} else if (dev->id) {
return g_strdup(dev->id);
}
return object_get_canonical_path(OBJECT(dev));
return object_get_canonical_path(OBJECT(dev)) ?: g_strdup("");
}
/*