On 29/02/2024 15.39, Zhao Liu wrote:
From: Zhao Liu <[email protected]>As the comment in qapi/error, passing @errp to error_prepend() requires ERRP_GUARD(): * = Why, when and how to use ERRP_GUARD() = * * Without ERRP_GUARD(), use of the @errp parameter is restricted: ... * - It should not be passed to error_prepend(), error_vprepend() or * error_append_hint(), because that doesn't work with &error_fatal. * ERRP_GUARD() lifts these restrictions. * * To use ERRP_GUARD(), add it right at the beginning of the function. * @errp can then be used without worrying about the argument being * NULL or &error_fatal. ERRP_GUARD() could avoid the case when @errp is the pointer of error_fatal, the user can't see this additional information, because exit() happens in error_setg earlier than information is added [1]. The vhost_scsi_realize() passes @errp to error_prepend(), and as a VirtioDeviceClass.realize method, its @errp is from DeviceClass.realize so that there is no guarantee that the @errp won't point to @error_fatal. To avoid the issue like [1] said, add missing ERRP_GUARD() at the beginning of this function. [1]: Issue description in the commit message of commit ae7c80a7bd73 ("error: New macro ERRP_GUARD()"). Cc: "Michael S. Tsirkin" <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: Fam Zheng <[email protected]> Signed-off-by: Zhao Liu <[email protected]> --- hw/scsi/vhost-scsi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c index 58a00336c2db..ae26bc19a457 100644 --- a/hw/scsi/vhost-scsi.c +++ b/hw/scsi/vhost-scsi.c @@ -220,6 +220,7 @@ static int vhost_scsi_set_workers(VHostSCSICommon *vsc, bool per_virtqueue)static void vhost_scsi_realize(DeviceState *dev, Error **errp){ + ERRP_GUARD(); VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev); Error *err = NULL;
I think you could remove the "err" variable and the error_propagate stuff in here now.
Thomas
