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strtoul_ui: reject negative values

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strtoul_ui uses strtoul to get a long unsigned, then checks that casting
to unsigned does not lose information and return the casted value.

On 64 bits architecture, checking that the cast does not change the value
catches most errors, but when sizeof(int) == sizeof(long) (e.g. i386),
the check does nothing. Unfortunately, strtoul silently accepts negative
values, and as a result strtoul_ui("-1", ...) raised no error.

This patch catches negative values before it's too late, i.e. before
calling strtoul.

Reported-by: Max Kirillov <max@max630.net>
Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matthieu Moy 2015-09-17 18:28:33 +02:00 committed by Junio C Hamano
parent 7b8419f094
commit e6f2599cba
1 changed files with 3 additions and 0 deletions
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3
git-compat-util.h
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@ -812,6 +812,9 @@ static inline int strtoul_ui(char const *s, int base, unsigned int *result)
char *p;
errno = 0;
/* negative values would be accepted by strtoul */
if (strchr(s, '-'))
return -1;
ul = strtoul(s, &p, base);
if (errno || *p || p == s || (unsigned int) ul != ul)
return -1;