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block: Fix anonymous BBs in blk_root_inactivate()

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blk->name isn't an array, but a pointer that can be NULL. Checking for
an anonymous BB must involve a NULL check first, otherwise we get
crashes.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Kevin Wolf 2017-05-22 17:03:39 +02:00
parent 64175afc69
commit 93c26503e0
1 changed files with 1 additions and 1 deletions
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2
block/block-backend.c
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@ -168,7 +168,7 @@ static int blk_root_inactivate(BdrvChild *child)
* this point because the VM is stopped) and unattached monitor-owned
* BlockBackends. If there is still any other user like a block job, then
* we simply can't inactivate the image. */
if (!blk->dev && !blk->name[0]) {
if (!blk->dev && !blk_name(blk)[0]) {
return -EPERM;
}