Fix for CVE-2012-4527.
Authored by Attila Bogar and Jean-Michel Vourgère <jmv_deb@nirgal.com>

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura mcrypt-2.6.8.orig/src/mcrypt.c mcrypt-2.6.8/src/mcrypt.c
--- mcrypt-2.6.8.orig/src/mcrypt.c	2013-01-14 19:15:49.465925072 -0300
+++ mcrypt-2.6.8/src/mcrypt.c	2013-01-14 19:28:13.711478000 -0300
@@ -44,7 +44,9 @@
 static char rcsid[] =
     "$Id: mcrypt.c,v 1.2 2007/11/07 17:10:21 nmav Exp $";
 
-char tmperr[128];
+/* Temporary error message can contain one file name and 1k of text */
+#define ERRWIDTH ((PATH_MAX)+1024)
+char tmperr[ERRWIDTH];
 unsigned int stream_flag = FALSE;
 char *keymode = NULL;
 char *mode = NULL;
@@ -482,7 +484,7 @@
 #ifdef HAVE_STAT
       if (stream_flag == FALSE) {
 	 if (is_normal_file(file[i]) == FALSE) {
-	    sprintf(tmperr,
+	    snprintf(tmperr, ERRWIDTH,
 		    _
 		    ("%s: %s is not a regular file. Skipping...\n"),
 		    program_name, file[i]);
@@ -501,7 +503,7 @@
 	    dinfile = file[i];
 	 if ((isatty(fileno((FILE *) (stdin))) == 1)
 	     && (stream_flag == TRUE) && (force == 0)) {	/* not a tty */
-	    sprintf(tmperr,
+	    snprintf(tmperr, ERRWIDTH,
 		    _
 		    ("%s: Encrypted data will not be read from a terminal.\n"),
 		    program_name);
@@ -520,7 +522,7 @@
 	    einfile = file[i];
 	 if ((isatty(fileno((FILE *) (stdout))) == 1)
 	     && (stream_flag == TRUE) && (force == 0)) {	/* not a tty */
-	    sprintf(tmperr,
+	    snprintf(tmperr, ERRWIDTH,
 		    _
 		    ("%s: Encrypted data will not be written to a terminal.\n"),
 		    program_name);
@@ -544,7 +546,7 @@
 	    strcpy(outfile, einfile);
 	    /* if file has already the .nc ignore it */
 	    if (strstr(outfile, ".nc") != NULL) {
-	       sprintf(tmperr,
+	       snprintf(tmperr, ERRWIDTH,
 		       _
 		       ("%s: file %s has the .nc suffix... skipping...\n"),
 		       program_name, outfile);
@@ -590,10 +592,10 @@
 
 	 if (x == 0) {
 	    if (stream_flag == FALSE) {
-	       sprintf(tmperr, _("File %s was decrypted.\n"), dinfile);
+	       snprintf(tmperr, ERRWIDTH, _("File %s was decrypted.\n"), dinfile);
 	       err_warn(tmperr);
 	    } else {
-	       sprintf(tmperr, _("Stdin was decrypted.\n"));
+	       snprintf(tmperr, ERRWIDTH, _("Stdin was decrypted.\n"));
 	       err_warn(tmperr);
 	    }
 #ifdef HAVE_STAT
@@ -610,7 +612,7 @@
 
 	 } else {
 	    if (stream_flag == FALSE) {
-	       sprintf(tmperr,
+	       snprintf(tmperr, ERRWIDTH,
 		       _
 		       ("File %s was NOT decrypted successfully.\n"),
 		       dinfile);
@@ -636,10 +638,10 @@
 
 	 if (x == 0) {
 	    if (stream_flag == FALSE) {
-	       sprintf(tmperr, _("File %s was encrypted.\n"), einfile);
+	       snprintf(tmperr, ERRWIDTH, _("File %s was encrypted.\n"), einfile);
 	       err_warn(tmperr);
 	    } else {
-	       sprintf(tmperr, _("Stdin was encrypted.\n"));
+	       snprintf(tmperr, ERRWIDTH, _("Stdin was encrypted.\n"));
 	       err_warn(tmperr);
 	    }
 #ifdef HAVE_STAT
@@ -655,7 +657,7 @@
 
 	 } else {
 	    if (stream_flag == FALSE) {
-	       sprintf(tmperr,
+	       snprintf(tmperr, ERRWIDTH,
 		       _
 		       ("File %s was NOT encrypted successfully.\n"),
 		       einfile);