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virtio-rng: Add human-readable error message for negative max-bytes parameter

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If a negative integer is used for the max_bytes parameter, QEMU currently
calls abort() and leaves behind a core dump. This patch replaces the
abort with a simple error message to make the reason for the termination
clearer. This also ensures device-hotplug with invalid input doesn't
cause qemu to quit.

There is an underlying insufficiency in the parameter parsing code of QEMU
that renders it unable to reject negative values for unsigned properties,
thus the error message "a non-negative integer below 2^63" is the most
user-friendly and correct message we can give until the underlying
insufficiency is corrected.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
John Snow 2014-07-21 17:44:37 -04:00 committed by Amit Shah
parent 35858955e6
commit 713e8a1022
1 changed files with 7 additions and 1 deletions
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8
hw/virtio/virtio-rng.c
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@ -181,7 +181,13 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
vrng->vq = virtio_add_queue(vdev, 8, handle_input);
assert(vrng->conf.max_bytes <= INT64_MAX);
/* Workaround: Property parsing does not enforce unsigned integers,
* So this is a hack to reject such numbers. */
if (vrng->conf.max_bytes > INT64_MAX) {
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "max-bytes",
"a non-negative integer below 2^63");
return;
}
vrng->quota_remaining = vrng->conf.max_bytes;
vrng->rate_limit_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,