[PATCH v3 RESEND 1/3] nvram: at24c: prevent segfault by checking "rom-size"

[Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>]

The value for "rom-size" is used as a divisor, so it must not be 0 or it
will segfault. A size of 0 wouldn't make sense anyhow.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
 hw/nvram/eeprom_at24c.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/nvram/eeprom_at24c.c b/hw/nvram/eeprom_at24c.c
index 22183f5360..ccf78b25e4 100644
--- a/hw/nvram/eeprom_at24c.c
+++ b/hw/nvram/eeprom_at24c.c
@@ -121,6 +121,11 @@ int at24c_eeprom_init(I2CSlave *i2c)
 {
     EEPROMState *ee = AT24C_EE(i2c);
 
+    if (!ee->rsize) {
+        ERR("rom-size not allowed to be 0\n");
+        exit(1);
+    }
+
     ee->mem = g_malloc0(ee->rsize);
 
     if (ee->blk) {
-- 
2.11.0