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misc: fix invalid character recongition in strto*l

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Would previously allow digits larger than the base and didn't check that
subtracting the difference from 0-9 to lowercase letters for characters
larger than 9 didn't result in a value lower than 9, which allowed the
parses: ` = 9, _ = 8, ^ = 7, ] = 6, \ = 5, and [ = 4

Patch-Name: misc-fix-invalid-char-strtol.patch
This commit is contained in:
Aaron Miller 2016-10-27 17:33:07 -04:00 committed by Colin Watson
parent 94166a6219
commit f8bd1b8aef
1 changed files with 5 additions and 1 deletions
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6
grub-core/kern/misc.c
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@ -394,9 +394,13 @@ grub_strtoull (const char *str, char **end, int base)
if (digit > 9)
{
digit += '0' - 'a' + 10;
if (digit >= (unsigned long) base)
/* digit <= 9 check is needed to keep chars larger than
'9' but less than 'a' from being read as numbers */
if (digit >= (unsigned long) base || digit <= 9)
break;
}
if (digit >= (unsigned long) base)
break;
found = 1;