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| author | Kevin Wolf <kwolf@redhat.com> | 2016-06-23 09:30:01 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2016-07-05 16:46:26 +0200 |
| commit | a9d52a75634ac9aa7d101bf7f63e10bf6655a865 (patch) | |
| tree | a13456344c8aeea7e2d9eb2ea82c307f9e786185 /hw/core | |
| parent | 1c42f149ddc1ff7dd897ef2696ad662955a5ab2b (diff) | |
| download | qemu-a9d52a75634ac9aa7d101bf7f63e10bf6655a865.zip qemu-a9d52a75634ac9aa7d101bf7f63e10bf6655a865.tar.gz qemu-a9d52a75634ac9aa7d101bf7f63e10bf6655a865.tar.bz2 | |
block/qdev: Fix NULL access when using BB twice
BlockBackend has only a single pointer to its guest device, so it makes
sure that only a single guest device is attached to it. device-add
returns an error if you try to attach a second device to a BB. In order
to make the error message nicer, -device that manually connects to a
if=none block device get a different message than -drive that implicitly
creates a guest device. The if=... option is stored in DriveInfo.
However, since blockdev-add exists, not every BlockBackend has a
DriveInfo any more. Check that it exists before we dereference it.
QMP reproducer resulting in a segfault:
{"execute":"blockdev-add","arguments":{"options":{"id":"disk","driver":"file","filename":"/tmp/test.img"}}}
{"execute":"device_add","arguments":{"driver":"virtio-blk-pci","drive":"disk"}}
{"execute":"device_add","arguments":{"driver":"virtio-blk-pci","drive":"disk"}}
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'hw/core')
| -rw-r--r-- | hw/core/qdev-properties-system.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index 891219a..df38b8a 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -82,7 +82,7 @@ static void parse_drive(DeviceState *dev, const char *str, void **ptr, if (blk_attach_dev(blk, dev) < 0) { DriveInfo *dinfo = blk_legacy_dinfo(blk); - if (dinfo->type != IF_NONE) { + if (dinfo && dinfo->type != IF_NONE) { error_setg(errp, "Drive '%s' is already in use because " "it has been automatically connected to another " "device (did you need 'if=none' in the drive options?)", |