File tiff-CVE-2023-2908.patch of Package tiff.34105

Index: tiff-4.0.9/libtiff/tif_dir.c
===================================================================
--- tiff-4.0.9.orig/libtiff/tif_dir.c
+++ tiff-4.0.9/libtiff/tif_dir.c
@@ -133,10 +133,10 @@ static uint16
 countInkNamesString(TIFF *tif, uint32 slen, const char *s)
 {
 	uint16 i = 0;
-	const char *ep = s + slen;
-	const char *cp = s;
 
 	if (slen > 0) {
+		const char *ep = s + slen;
+		const char *cp = s;
 		do {
 			for (; cp < ep && *cp != '\0'; cp++) {}
 			if (cp >= ep)