Fix null dereference in basename

On older kernels (<=linux-5.17), argv[0] can be null. Basename would
call strrchr with null if argc==0. Fixes issue #680

diff --git a/libmisc/basename.c b/libmisc/basename.c
index fe916532240d85c55be278909ec79e5d71e64298..95a2f85dd6ce5d30361f86b435770b65e8c43ebf 100644 (file)
--- a/libmisc/basename.c
+++ b/libmisc/basename.c
@@ -21,6 +21,10 @@
 #include "prototypes.h"
 /*@observer@*/const char *Basename (const char *str)
 {
+       if (str == NULL) {
+               abort ();
+       }
+
        char *cp = strrchr (str, '/');
 
        return (NULL != cp) ? cp + 1 : str;