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hw/arm/omap1: Avoid unintended sign extension writing omap_rtc YEARS_REG

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When writing to the YEARS_REG register, if the year value is
99 then the multiplication by 31536000 will overflow into
the sign bit of a 32 bit value and then be erroneously
sign-extended if time_t is 64 bits. Add a cast to avoid this.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
This commit is contained in:
Peter Maydell 2014-05-13 16:09:39 +01:00
parent c94239fe56
commit 7e7e5858f8
1 changed files with 2 additions and 2 deletions
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4
hw/arm/omap1.c
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@ -2709,8 +2709,8 @@ static void omap_rtc_write(void *opaque, hwaddr addr,
s->ti += ti[1];
} else {
/* A less accurate version */
s->ti -= (s->current_tm.tm_year % 100) * 31536000;
s->ti += from_bcd(value) * 31536000;
s->ti -= (time_t)(s->current_tm.tm_year % 100) * 31536000;
s->ti += (time_t)from_bcd(value) * 31536000;
}
return;