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);
 }
 
 /*
ac9591c9dc958b'>root</a>/<a href='/guix/log/tests?id=c469a8b09e6cb54d0d7e76f1baac9591c9dc958b'>tests</a>/<a href='/guix/log/tests/ipfs.scm?id=c469a8b09e6cb54d0d7e76f1baac9591c9dc958b'>ipfs.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/ipfs.scm?id=c469a8b09e6cb54d0d7e76f1baac9591c9dc958b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-04-12 18:42:22 +0200'>2021-04-12</span></td><td><a href='/guix/commit/tests/ipfs.scm?id=b18f45c21f5d697d384a7bd5c9d3ee314bba9e35'>Add (guix ipfs).</a><span class='msg-avail'>...<span class='msg-tooltip'>This module allows for communicating with the IPFS
gateway over the HTTP interface.  The commit has been
cherry-picked from &lt;https://issues.guix.gnu.org/33899&gt;.

The procedures for adding and restoring file trees have
been removed as according to a reply issue 33899, a different
format will be used.  The procedure 'add-data' has been
exported as it will be used in the system test for IPFS.

* guix/ipfs.scm: New file.
* Makefile.am (MODULES): Add it.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Ludovic Courtès</td></tr>