[PATCH v2 02/11] softmmu/dirtylimit: Add parameter check for hmp "set_vcpu_dirty_limit"

[huangy81]

From: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>

dirty_rate paraemter of hmp command "set_vcpu_dirty_limit" is invalid
if less than 0, so add parameter check for it.

Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
---
 softmmu/dirtylimit.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/softmmu/dirtylimit.c b/softmmu/dirtylimit.c
index 940d238..c42eddd 100644
--- a/softmmu/dirtylimit.c
+++ b/softmmu/dirtylimit.c
@@ -515,6 +515,11 @@ void hmp_set_vcpu_dirty_limit(Monitor *mon, const QDict 
*qdict)
     int64_t cpu_index = qdict_get_try_int(qdict, "cpu_index", -1);
     Error *err = NULL;
 
+    if (dirty_rate < 0) {
+        monitor_printf(mon, "invalid dirty page limit %ld\n", dirty_rate);
+        return;
+    }
+
     qmp_set_vcpu_dirty_limit(!!(cpu_index != -1), cpu_index, dirty_rate, &err);
     if (err) {
         hmp_handle_error(mon, err);
-- 
1.8.3.1