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sh: Reject integer overflow in number and is_number.

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This commit is contained in:
Jilles Tjoelker 2014-08-17 16:40:29 +00:00
parent 1c9c6ea481
commit d53f7f64f7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=270102
1 changed files with 11 additions and 3 deletions
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14
bin/sh/mystring.c
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@ -82,9 +82,17 @@ number(const char *s)
int int
is_number(const char *p) is_number(const char *p)
{ {
do { const char *q;
if (! is_digit(*p))
if (*p == '\0')
return 0;
while (*p == '0')
p++;
for (q = p; *q != '\0'; q++)
if (! is_digit(*q))
return 0; return 0;
} while (*++p != '\0'); if (q - p > 10 ||
(q - p == 10 && memcmp(p, "2147483647", 10) > 0))
return 0;
return 1; return 1;
} }