File CVE-2019-20633.patch of Package patch

commit a09d9519a57e84d8e2ad592fbba09e8a9faf55f8
Author: Wolfgang Frisch <wolfgang.frisch@suse.com>
Date:   Tue Jul 30 14:17:32 2024 +0200

    Fix double-free/OOB read in pch.c (CVE-2019-20633)
    
    see also: https://savannah.gnu.org/bugs/index.php?56683#comment1

Index: patch-2.8/src/pch.c
===================================================================
--- patch-2.8.orig/src/pch.c
+++ patch-2.8/src/pch.c
@@ -1200,8 +1200,11 @@ another_hunk (enum diff difftype, bool r
     while (p_end >= 0) {
 	if (p_end == p_efake)
 	    p_end = p_bfake;		/* don't free twice */
-	else
+	else {
 	    free(p_line[p_end]);
+	    p_line[p_end] = NULL;
+	    p_len[p_end] = 0;
+	}
 	p_end--;
     }
     assert (p_end < 0);