From 010ef312704884412f63b1d6bcb308a766f21f6a Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Fri, 19 May 2017 14:29:46 +0200
Subject: [PATCH 26/27] block: An empty filename counts as no filename
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RH-Author: Max Reitz <mreitz@redhat.com>
Message-id: <20170519142946.22012-2-mreitz@redhat.com>
Patchwork-id: 75383
O-Subject: [RHV-7.4 qemu-kvm-rhev PATCH 1/1] block: An empty filename counts as no filename
Bugzilla: 1452702
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Wei Huang <wei@redhat.com>
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>

Reproducer:
    $ ./qemu-img info ''
    qemu-img: ./block.c:1008: bdrv_open_driver: Assertion
        `!drv->bdrv_needs_filename || bs->filename[0]' failed.
    [1]    26105 abort (core dumped)  ./qemu-img info ''

This patch fixes this to be:
    $ ./qemu-img info ''
    qemu-img: Could not open '': The 'file' block driver requires a file
    name

Cc: qemu-stable <qemu-stable@nongnu.org>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 4a0082401a770261b85625a41eef4a4e89ad7a74)
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block.c b/block.c
index 6201991..5bc0504 100644
--- a/block.c
+++ b/block.c
@@ -1204,7 +1204,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file,
         filename = qdict_get_try_str(options, "filename");
     }
 
-    if (drv->bdrv_needs_filename && !filename) {
+    if (drv->bdrv_needs_filename && (!filename || !filename[0])) {
         error_setg(errp, "The '%s' block driver requires a file name",
                    drv->format_name);
         ret = -EINVAL;
-- 
1.8.3.1