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block/amend: Check whether the node exists

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We should check whether the user-specified node-name actually refers to
a node.  The simplest way to do that is to use bdrv_lookup_bs() instead
of bdrv_find_node() (the former wraps the latter, and produces an error
message if necessary).

Reported-by: Coverity (CID 1430268)
Fixes: ced914d0ab
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200710095037.10885-1-mreitz@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
This commit is contained in:
Max Reitz 2020-07-10 11:50:37 +02:00
parent 4215d34132
commit 984c367814
1 changed files with 5 additions and 1 deletions
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6
block/amend.c
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@ -69,8 +69,12 @@ void qmp_x_blockdev_amend(const char *job_id,
BlockdevAmendJob *s;
const char *fmt = BlockdevDriver_str(options->driver);
BlockDriver *drv = bdrv_find_format(fmt);
BlockDriverState *bs = bdrv_find_node(node_name);
BlockDriverState *bs;
bs = bdrv_lookup_bs(NULL, node_name, errp);
if (!bs) {
return;
}
if (!drv) {
error_setg(errp, "Block driver '%s' not found or not supported", fmt);