https://sources.debian.org/data/main/a/a2ps/1:4.14-2/debian/patches/fix-format-security.diff

Index: b/lib/psgen.c
===================================================================
--- a/lib/psgen.c
+++ b/lib/psgen.c
@@ -232,7 +232,7 @@
     default:
       *buf = '\0';
       ps_escape_char (job, cp[i], buf);
-      output (jdiv, (char *) buf);
+      output (jdiv, "%s", (char *) buf);
       break;
     }
   }
Index: b/lib/output.c
===================================================================
--- a/lib/output.c
+++ b/lib/output.c
@@ -525,7 +525,7 @@
 		     expand_user_string (job, FIRST_FILE (job),
 					 (const uchar *) "Expand: requirement",
 					 (const uchar *) token));
-	output (dest, expansion);
+	output (dest, "%s", expansion);
 	continue;
       }
 
Index: b/lib/parseppd.y
===================================================================
--- a/lib/parseppd.y
+++ b/lib/parseppd.y
@@ -154,7 +154,7 @@
 void
 yyerror (const char *msg)
 {
-  error_at_line (1, 0, ppdfilename, ppdlineno, msg);
+  error_at_line (1, 0, ppdfilename, ppdlineno, "%s", msg);
 }
 
 /*
Index: b/src/parsessh.y
===================================================================
--- a/src/parsessh.y
+++ b/src/parsessh.y
@@ -740,7 +740,7 @@
 void
 yyerror (const char *msg)
 {
-  error_at_line (1, 0, sshfilename, sshlineno, msg);
+  error_at_line (1, 0, sshfilename, sshlineno, "%s", msg);
 }
 
 /*
Index: b/lib/parseppd.c
===================================================================
--- a/lib/parseppd.c
+++ b/lib/parseppd.c
@@ -1707,7 +1707,7 @@
 void
 yyerror (const char *msg)
 {
-  error_at_line (1, 0, ppdfilename, ppdlineno, msg);
+  error_at_line (1, 0, ppdfilename, ppdlineno, "%s", msg);
 }
 
 /*
Index: b/src/parsessh.c
===================================================================
--- a/src/parsessh.c
+++ b/src/parsessh.c
@@ -2639,7 +2639,7 @@
 void
 yyerror (const char *msg)
 {
-  error_at_line (1, 0, sshfilename, sshlineno, msg);
+  error_at_line (1, 0, sshfilename, sshlineno, "%s", msg);
 }
 
 /*
d=999a448861fc8ff34099c085b7309263a5791126'>root</a>/<a href='/guix/log/tests?id=999a448861fc8ff34099c085b7309263a5791126'>tests</a>/<a href='/guix/log/tests/upstream.scm?id=999a448861fc8ff34099c085b7309263a5791126'>upstream.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/upstream.scm?id=999a448861fc8ff34099c085b7309263a5791126&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-01-05 21:17:58 +0100'>2022-01-05</span></td><td><a href='/guix/commit/tests/upstream.scm?id=6226df77ee7448ba4eae05c14aa2ba9721f28bb4'>tests: Add failing tests for changed-inputs on new style inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/upstream.scm ("changed-inputs returns changes to plain input list",
"changed-inputs returns changes to all plain input lists"): New tests.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2022-01-05 21:17:54 +0100'>2022-01-05</span></td><td><a href='/guix/commit/tests/upstream.scm?id=a6bf1c108ef3b0d63d6d6070b90093bc8f434734'>tests: Add tests for changed-inputs on old-style inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>All these tests pass, because they only test the old-style input alists with
labels.

* tests/upstream.scm ("changed-inputs returns no changes",
"changed-inputs returns changes to labelled input list",
"changed-inputs returns changes to all labelled input lists"): New tests.
</span></span></td><td>Ricardo Wurmus</td></tr>