[PATCH] hw/arm/aspeed: avoid sign mismatch on sscanf for uart property

using "%u" with sscanf() was likely meant to indicate that a
negative value was unexpected, but with a signed variable it
could result in undefined behaviour.

use "%d" and check for a negative input explicitly.

Signed-off-by: Carlo Marcelo Arenas Belón <[email protected]>
---
 hw/arm/aspeed.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
index a48c442058..a9238e6217 100644
--- a/hw/arm/aspeed.c
+++ b/hw/arm/aspeed.c
@@ -327,7 +327,7 @@ static void aspeed_set_bmc_console(Object *obj, const char *value, Error **errp)
     int uart_first = aspeed_uart_first(sc->uarts_base);
     int uart_last = aspeed_uart_last(sc->uarts_base, sc->uarts_num);
 
-    if (sscanf(value, "uart%u", &val) != 1) {
+    if (sscanf(value, "uart%d", &val) != 1 || val < 0) {
         error_setg(errp, "Bad value for \"uart\" property");
         return;
     }
-- 
2.50.1 (Apple Git-155)