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Avoid division by zero in serial.

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Vladimir Serbinenko committed 2015-01-21 17:42:13 +01:00
1 parent 4816dcac19
commit e95685dab1
3 files changed
+17 -1
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grub-core/term/ns8250.c
+2
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@@ -57,6 +57,8 @@ serial_get_divisor (const struct grub_serial_port *port __attribute__ ((unused))
base_clock = config->base_clock ? (config->base_clock >> 4) : DEFAULT_BASE_CLOCK;
divisor = (base_clock + (config->speed / 2)) / config->speed;
if (config->speed == 0)
return 0;
if (divisor > 0xffff || divisor == 0)
return 0;
actual_speed = base_clock / divisor;