use string literals as format strings (#1037316)

sane-backends-1.0.24-format-security.patch

@@ -0,0 +1,139 @@
+From d1c0b7d119bb9dd2c51143b44cc86a369f453746 Mon Sep 17 00:00:00 2001
+From: Nils Philippsen <nils@redhat.com>
+Date: Wed, 4 Dec 2013 15:21:19 +0100
+Subject: [PATCH] patch: format-security
+
+Squashed commit of the following:
+
+commit 19e071b9f6d477462a0f4afbbd17acd15268ddfa
+Author: Nils Philippsen <nils@redhat.com>
+Date:   Wed Dec 4 15:04:12 2013 +0100
+
+    avoid using string formats insecurely with "-f"
+
+    In the process, simplify processing the device list format: don't copy
+    the format string for writing \0 into it, just iterate over chunks in
+    the original string.
+
+    (cherry picked from commit 8082a42ec4f3b3cf2cffc30a45dda5fc41d55576)
+---
+ frontend/scanimage.c | 52 ++++++++++++++++++++--------------------------------
+ 1 file changed, 20 insertions(+), 32 deletions(-)
+
+diff --git a/frontend/scanimage.c b/frontend/scanimage.c
+index d41c849..9e1bcfb 100644
+--- a/frontend/scanimage.c
++++ b/frontend/scanimage.c
+@@ -1826,23 +1826,16 @@ main (int argc, char **argv)
+ 	    else
+ 	      {
+ 		int i = 0, int_arg = 0;
+-		char *percent, *start, *fmt;
++		const char *percent, *start;
+ 		const char *text_arg = 0;
+-		char cc, ftype;
+-
+-		fmt = malloc (strlen (optarg) + 1);
+-		if (fmt == 0)
+-		  {
+-		    fprintf (stderr, "%s: not enough memory\n", prog_name);
+-		    exit (1);
+-		  }
++		char ftype;
+ 
+ 		for (i = 0; device_list[i]; ++i)
+ 		  {
+-		    strcpy (fmt, optarg);
+-		    start = fmt;
++		    start = optarg;
+ 		    while (*start && (percent = strchr (start, '%')))
+ 		      {
++			int start_len = percent - start;
+ 			percent++;
+ 			if (*percent)
+ 			  {
+@@ -1850,19 +1843,19 @@ main (int argc, char **argv)
+ 			      {
+ 			      case 'd':
+ 				text_arg = device_list[i]->name;
+-				ftype = *percent = 's';
++				ftype = 's';
+ 				break;
+ 			      case 'v':
+ 				text_arg = device_list[i]->vendor;
+-				ftype = *percent = 's';
++				ftype = 's';
+ 				break;
+ 			      case 'm':
+ 				text_arg = device_list[i]->model;
+-				ftype = *percent = 's';
++				ftype = 's';
+ 				break;
+ 			      case 't':
+ 				text_arg = device_list[i]->type;
+-				ftype = *percent = 's';
++				ftype = 's';
+ 				break;
+ 			      case 'i':
+ 				int_arg = i;
+@@ -1870,45 +1863,40 @@ main (int argc, char **argv)
+ 				break;
+ 			      case 'n':
+ 				text_arg = "\n";
+-				ftype = *percent = 's';
++				ftype = 's';
+ 				break;
+ 			      case '%':
+-				ftype = 0;
++				text_arg = "%";
++				ftype = 's';
+ 				break;
+ 			      default:
+ 				fprintf (stderr,
+ 					 "%s: unknown format specifier %%%c\n",
+ 					 prog_name, *percent);
+-				*percent = '%';
+-				ftype = 0;
++                                text_arg = "%";
++				ftype = 's';
+ 			      }
+-			    percent++;
+-			    cc = *percent;
+-			    *percent = 0;
++			    printf ("%.*s", start_len, start);
+ 			    switch (ftype)
+ 			      {
+ 			      case 's':
+-				printf (start, text_arg);
++				printf ("%s", text_arg);
+ 				break;
+ 			      case 'i':
+-				printf (start, int_arg);
+-				break;
+-			      case 0:
+-				printf (start);
++				printf ("%i", int_arg);
+ 				break;
+ 			      }
+-			    *percent = cc;
+-			    start = percent;
++			    start = percent + 1;
+ 			  }
+ 			else
+ 			  {
+-			    /* last char of the string is a '%', suppress it */
+-			    *start = 0;
++			    /* last char of the string is a '%', ignore it */
++			    start++;
+ 			    break;
+ 			  }
+ 		      }
+ 		    if (*start)
+-		      printf (start);
++		      printf ("%s", start);
+ 		  }
+ 	      }
+ 	    if (i == 0 && ch != 'f')
+-- 
+1.8.4.2
+

sane-backends.spec

@@ -37,7 +37,7 @@
 Summary: Scanner access software
 Name: sane-backends
 Version: 1.0.24
-Release: 7%{?dist}
+Release: 8%{?dist}
 # lib/ is LGPLv2+, backends are GPLv2+ with exceptions
 # Tools are GPLv2+, docs are public domain
 # see LICENSE for details
@@ -75,6 +75,8 @@ Patch5: sane-backends-1.0.24-pixma_bjnp-crash.patch
 Patch6: sane-backends-1.0.24-static-code-check.patch
 # Upstream commit 758731489d0d58bab6e4b70db9556038c9f4bb67
 Patch7: sane-backends-1.0.24-scsi-permissions.patch
+# Upstream commit 8082a42ec4f3b3cf2cffc30a45dda5fc41d55576
+Patch8: sane-backends-1.0.24-format-security.patch
 
 URL: http://www.sane-project.org
 
@@ -312,6 +314,9 @@ udevadm hwdb --update >/dev/null 2>&1 || :
 %{_libdir}/sane/*gphoto2.so*
 
 %changelog
+* Wed Dec 04 2013 Nils Philippsen <nils@redhat.com> - 1.0.24-8
+- use string literals as format strings (#1037316)
+
 * Wed Nov 20 2013 Nils Philippsen <nils@redhat.com> - 1.0.24-7
 - set correct permissions for SCSI devices (#1028549)