Commit 91162849 authored by Luiz Capitulino's avatar Luiz Capitulino

hmp: fix bad value conversion for M type

The M type converts from megabytes to bytes. However, the value can be
negative before the conversion, which will lead to a flawed conversion.

For example, this:

 (qemu) balloon -1000000000000011

Just "works", but the value passed by the balloon command will be
something else.

This patch fixes this problem by requering a positive value before
converting. There's really no reason to accept a negative value for
the M type.
Signed-off-by: default avatarLuiz Capitulino <>
Reviewed-by: default avatarEric Blake <>
parent 6b0e33be
......@@ -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));
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