--- kernel/pid.c

+++ kernel/pid.c

@@ -182,11 +182,14 @@ static int alloc_pidmap(struct pid_names

return -1;

}

-int next_pidmap(struct pid_namespace *pid_ns, int last)

+int next_pidmap(struct pid_namespace *pid_ns, unsigned int last)

{

int offset;

struct pidmap *map, *end;

+ if (last >= PID_MAX_LIMIT)

+ return -1;

+

offset = (last + 1) & BITS_PER_PAGE_MASK;

map = &pid_ns->pidmap[(last + 1)/BITS_PER_PAGE];

end = &pid_ns->pidmap[PIDMAP_ENTRIES];