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Avoid division by zero in serial.

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This commit is contained in:
Vladimir Serbinenko 2015-01-20 20:41:36 +01:00
parent 4816dcac19
commit e95685dab1
3 changed files with 17 additions and 1 deletions
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2
grub-core/term/ns8250.c
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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;