libbb: add sanity check in bb_arg_max()
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/sysconf.c b/libbb/sysconf.c
index cfad9cd..8c1caef 100644
--- a/libbb/sysconf.c
+++ b/libbb/sysconf.c
@@ -11,7 +11,15 @@
#if !defined(bb_arg_max)
unsigned FAST_FUNC bb_arg_max(void)
{
- return sysconf(_SC_ARG_MAX);
+ long r = sysconf(_SC_ARG_MAX);
+
+ /* I've seen a version of uclibc which returned -1.
+ * Guard about it, and also avoid insanely large values
+ */
+ if ((unsigned long)r > 64*1024*1024)
+ r = 64*1024*1024;
+
+ return r;
}
#endif
