diff -urpN glibc-2.34-sanitize-env/stdlib/qsort.c glibc-2.34-qsort/stdlib/qsort.c
--- glibc-2.34-sanitize-env/stdlib/qsort.c	2021-08-02 03:33:43.000000000 +0200
+++ glibc-2.34-qsort/stdlib/qsort.c	2024-01-31 17:21:15.061418442 +0100
@@ -225,7 +225,7 @@ _quicksort (void *const pbase, size_t to
     while ((run_ptr += size) <= end_ptr)
       {
 	tmp_ptr = run_ptr - size;
-	while ((*cmp) ((void *) run_ptr, (void *) tmp_ptr, arg) < 0)
+	while (tmp_ptr > base_ptr && (*cmp) ((void *) run_ptr, (void *) tmp_ptr, arg) < 0)
 	  tmp_ptr -= size;
 
 	tmp_ptr += size;