Description: Ensure that our variable checking for >= 0 is signed
 The type of v->n is size_t, which is an unsigned type, and we are assigning
 v->n - 1 to i and looping while this is >= 0.  If v->n == 0, on some
 architectures (armhf) this results in i being set to a positive value
 (specifically, UINT32_MAX).
Author: Steve Langasek <steve.langasek@ubuntu.com>
Last-Update: 2020-03-17

Index: fermi-lite-0.1/mag.c
===================================================================
--- fermi-lite-0.1.orig/mag.c
+++ fermi-lite-0.1/mag.c
@@ -506,7 +506,7 @@
 
 	for (j = 0; j < 2; ++j) {
 		sum_n = sum_l = 0;
-		for (i = v->n - 1; i >= 0; --i) {
+		for (i = (int64_t)v->n - 1; i >= 0; --i) {
 			const magv_t *p = &v->a[srt[i]<<32>>32];
 			int tmp1, tmp2;
 			tmp1 = tmp2 = 0;
