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rbd: Fix to cleanly reject -drive without pool or image 

qemu_rbd_open() neglects to check pool and image are present.  Missing
image is caught by rbd_open(), but missing pool crashes.  Reproducer:

    $ qemu-system-x86_64 -nodefaults -drive driver=rbd,id=rbd,image=i,...
    terminate called after throwing an instance of 'std::logic_error'
      what():  basic_string::_M_construct null not valid
    Aborted (core dumped)

where ... is a working server.0.{host,port} configuration.

Doesn't affect -drive with file=..., because qemu_rbd_parse_filename()
always sets both pool and image.

Doesn't affect -blockdev, because pool and image are mandatory in the
QAPI schema.

Fix by adding the missing checks.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-id: 1490691368-32099-3-git-send-email-armbru@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Markus Armbruster 2017-03-28 10:56:00 +02:00 committed by Jeff Cody
parent eb87203b64
commit f51c363c2b
1 changed files with 7 additions and 3 deletions
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8
block/rbd.c
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@ -711,6 +711,12 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
name = qemu_opt_get(opts, "image");
keypairs = qemu_opt_get(opts, "keyvalue-pairs");
if (!pool || !name) {
error_setg(errp, "Parameters 'pool' and 'image' are required");
r = -EINVAL;
goto failed_opts;
}
r = rados_create(&s->cluster, clientname);
if (r < 0) {
error_setg_errno(errp, -r, "error initializing");
@ -718,9 +724,7 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
}
s->snap = g_strdup(snap);
if (name) {
pstrcpy(s->name, RBD_MAX_IMAGE_NAME_SIZE, name);
}
/* try default location when conf=NULL, but ignore failure */
r = rados_conf_read_file(s->cluster, conf);