From b43def1519d18fecb6f23778e045838e30e027cc Mon Sep 17 00:00:00 2001
From: Su_Laus <sulau@freenet.de>
Date: Sat, 2 Apr 2022 22:33:31 +0200
Subject: [PATCH] (CVE-2022-1355) tiffcp: avoid buffer overflow in "mode"
 string (fixes #400)

(cherry picked from commit fb1db384959698edd6caeea84e28253d272a0f96)
---
 tools/tiffcp.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/tools/tiffcp.c b/tools/tiffcp.c
index d5f1d248..fb98bd57 100644
--- a/tools/tiffcp.c
+++ b/tools/tiffcp.c
@@ -249,19 +249,34 @@ main(int argc, char* argv[])
 			deftilewidth = atoi(optarg);
 			break;
 		case 'B':
-			*mp++ = 'b'; *mp = '\0';
+			if (strlen(mode) < (sizeof(mode) - 1))
+			{
+				*mp++ = 'b'; *mp = '\0';
+			}
 			break;
 		case 'L':
-			*mp++ = 'l'; *mp = '\0';
+			if (strlen(mode) < (sizeof(mode) - 1))
+			{
+				*mp++ = 'l'; *mp = '\0';
+			}
 			break;
 		case 'M':
-			*mp++ = 'm'; *mp = '\0';
+			if (strlen(mode) < (sizeof(mode) - 1))
+			{
+				*mp++ = 'm'; *mp = '\0';
+			}
 			break;
 		case 'C':
-			*mp++ = 'c'; *mp = '\0';
+			if (strlen(mode) < (sizeof(mode) - 1))
+			{
+				*mp++ = 'c'; *mp = '\0';
+			}
 			break;
 		case '8':
-			*mp++ = '8'; *mp = '\0';
+			if (strlen(mode) < (sizeof(mode)-1))
+			{
+				*mp++ = '8'; *mp = '\0';
+			}
 			break;
 		case 'x':
 			pageInSeq = 1;