haraldwolff/qemu-patch-raspberry4
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host-utils: Fix overflow detection in divu128()

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The previous code didn't detect overflows if the high 64-bit
of the dividend were equal to the 64-bit divisor. In that case,
64 bits wouldn't be enough to hold the quotient.

Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210910112624.72748-2-luis.pires@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Luis Pires 2021-09-10 08:26:03 -03:00 committed by David Gibson
parent 6b54a31bf7
commit 06c0259a08
1 changed files with 1 additions and 1 deletions
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2
util/host-utils.c
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@ -102,7 +102,7 @@ int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor)
*plow = dlo / divisor;
*phigh = dlo % divisor;
return 0;
} else if (dhi > divisor) {
} else if (dhi >= divisor) {
return 1;
} else {