From: "Daniel P. Berrange" <berra...@redhat.com> If the 9pfs mount tag is longer than MAX_TAG_LEN bytes, rather than silently truncating the tag which will likely break the guest OS, report an immediate error and exit QEMU
* hw/9pfs/virtio-9p-device.c: Report error & exit if mount tag is too long Signed-off-by: Daniel P. Berrange <berra...@redhat.com> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com> --- hw/9pfs/virtio-9p-device.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c index b23e8a4..0930d22 100644 --- a/hw/9pfs/virtio-9p-device.c +++ b/hw/9pfs/virtio-9p-device.c @@ -119,7 +119,9 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) s->ctx.fs_root = g_strdup(fse->path); len = strlen(conf->tag); if (len > MAX_TAG_LEN) { - len = MAX_TAG_LEN; + fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " + "maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN); + exit(1); } /* s->tag is non-NULL terminated string */ s->tag = g_malloc(len); -- 1.7.5.4