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Description of problem / steps to reproduce:

$ qemu-img info ''
qemu-img: block.c:1045: bdrv_open_driver: Assertion `!drv->bdrv_needs_filename || bs->filename[0]' failed.
[1]    14622 abort (core dumped)  ./qemu-img info ''


Version-Release number of selected component (if applicable):

qemu-kvm-rhev-2.9.0-5.el7


How reproducible:

Always


Expected results:

$ qemu-img info ''
qemu-img: Could not open '': The 'file' block driver requires a file name


Additional info:

Fixed in upstream commit 4a0082401a770261b85625a41eef4a4e89ad7a74.

Fix included in qemu-kvm-rhev-2.9.0-6.el7

Verify the issue with below packages:
kernel-3.10.0-671.el7.x86_64
qemu-kvm-rhev-2.9.0-6.el7

Test steps:
# qemu-img info ''
qemu-img: Could not open '': The 'file' block driver requires a file name

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:2392