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-rw-r--r--monitor.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/monitor.c b/monitor.c
index bf60984d8f..12a6fe25ad 100644
--- a/monitor.c
+++ b/monitor.c
@@ -89,8 +89,8 @@
* TODO lift the restriction
* 'i' 32 bit integer
* 'l' target long (32 or 64 bit)
- * 'M' just like 'l', except in user mode the value is
- * multiplied by 2^20 (think Mebibyte)
+ * 'M' Non-negative target long (32 or 64 bit), in user mode the
+ * value is multiplied by 2^20 (think Mebibyte)
* 'o' octets (aka bytes)
* user mode accepts an optional T, t, G, g, M, m, K, k
* suffix, which multiplies the value by 2^40 for
@@ -3622,6 +3622,10 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
monitor_printf(mon, "integer is for 32-bit values\n");
goto fail;
} else if (c == 'M') {
+ if (val < 0) {
+ monitor_printf(mon, "enter a positive value\n");
+ goto fail;
+ }
val <<= 20;
}
qdict_put(qdict, key, qint_from_int(val));