[Qemu-devel] [PATCH 1/2] pc_sysfw: Check for qemu_find_file() failure

[Markus Armbruster <armbru@redhat.com>]

pc_fw_add_pflash_drv() ignores qemu_find_file() failure, and happily
creates a drive without a medium.

When pc_system_flash_init() asks for its size, bdrv_getlength() fails
with -ENOMEDIUM, which isn't checked either.  It fails relatively
cleanly only because -ENOMEDIUM isn't a multiple of 4096:

    $ qemu-system-x86_64 -S -vnc :0 -bios nonexistant
    qemu: PC system firmware (pflash) must be a multiple of 0x1000
    [Exit 1 ]

Fix by handling the qemu_find_file() failure.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 hw/pc_sysfw.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/pc_sysfw.c b/hw/pc_sysfw.c
index b45f0ac..fd22154 100644
--- a/hw/pc_sysfw.c
+++ b/hw/pc_sysfw.c
@@ -84,6 +84,11 @@ static void pc_fw_add_pflash_drv(void)
         bios_name = BIOS_FILENAME;
     }
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+    if (!filename) {
+        error_report("Can't open BIOS image %s: %s",
+                     bios_name, strerror(errno));
+        exit(1);
+    }
 
     opts = drive_add(IF_PFLASH, -1, filename, "readonly=on");
 
-- 
1.7.11.2