taskset: tighten the check for stride values

function                                             old     new   delta
taskset_main                                         986     987      +1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/util-linux/taskset.c b/util-linux/taskset.c
index df1bc0a4f..b542f8c83 100644
--- a/util-linux/taskset.c
+++ b/util-linux/taskset.c
@@ -149,8 +149,8 @@ static void parse_cpulist(ul *mask, unsigned max, char *s)
                 if ((*s != ',' && *s != '\0')
                  || bit > end
                  || end == UINT_MAX /* bb_strtou returns this on malformed / ERANGE numbers */
-                 || stride == 0
-                 || stride == UINT_MAX
+                 || (stride - 1) > (UINT_MAX / 4)
+                /* disallow 0, malformed input, and too large stride prone to overflows */
                 ) {
                         bb_error_msg_and_die("bad affinity '%s'", aff);
                 }