Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxx>
---
xtables.c | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/xtables.c b/xtables.c
index 3c9a13f..e11a77e 100644
--- a/xtables.c
+++ b/xtables.c
@@ -15,7 +15,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-
+#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
@@ -430,11 +430,16 @@ bool xtables_strtoul(const char *s, char **end, unsigned long long *value,
unsigned long min, unsigned long max)
{
unsigned long v;
+ const char *p;
char *my_end;
errno = 0;
+ /* Since strtoul allows leading minus, we have to check for ourself. */
+ for (p = s; isspace(*p); ++p)
+ ;
+ if (*p == '-')
+ return false;
v = strtoul(s, &my_end, 0);
-
if (my_end == s)
return false;
if (end != NULL)
--
1.7.3.4
--
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