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util: Data overrun may lead to divide by zero

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Commit 87a8a30d6 added the function based on the virsh function,
but used an unsigned long long instead of a double and thus that
limits the maximum result.

Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
John Ferlan 2018-09-27 18:49:41 -04:00
parent fddf92836a
commit efdbfe57c7
1 changed files with 5 additions and 6 deletions
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11
src/util/virutil.c
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@ -491,6 +491,10 @@ virFormatIntDecimal(char *buf, size_t buflen, int val)
*
* Similar to vshPrettyCapacity, but operates on integers and not doubles
*
* NB: Since using unsigned long long, we are limited to at most a "PiB"
* to make pretty. This is because a PiB is 1152921504606846976 bytes,
* but that value * 1024 > ULLONG_MAX value 18446744073709551615 bytes.
*
* Returns shortened value that can be used with @unit.
*/
unsigned long long
@ -524,12 +528,7 @@ virFormatIntPretty(unsigned long long val,
return val / (limit / 1024);
}
limit *= 1024;
if (val % limit) {
*unit = "PiB";
return val / (limit / 1024);
}
limit *= 1024;
*unit = "EiB";
*unit = "PiB";
return val / (limit / 1024);
}