File ncurses-6.1-bsc1220061.patch of Package ncurses.35592

From ncurses-6.4-20230615.patch

improve checks in convert_string() for corrupt terminfo entry 

---
 ncurses/tinfo/read_entry.c |   67 ++++++++++++++++++++++++++++++---------------
 1 file changed, 46 insertions(+), 21 deletions(-)

--- ncurses/tinfo/read_entry.c
+++ ncurses/tinfo/read_entry.c	2024-02-19 10:10:00.838226984 +0000
@@ -139,12 +139,13 @@ convert_16bits(char *buf, NCURSES_INT2 *
 }
 #endif
 
-static void
-convert_strings(char *buf, char **Strings, int count, int size, char *table)
+static bool
+convert_strings(char *buf, char **Strings, int count, int size,
+		char *table, bool always)
 {
     int i;
     char *p;
-    bool corrupt = FALSE;
+    bool success = TRUE;
 
     for (i = 0; i < count; i++) {
 	if (IS_NEG1(buf + 2 * i)) {
@@ -160,26 +161,38 @@ convert_strings(char *buf, char **String
 		TR(TRACE_DATABASE, ("Strings[%d] = %s", i,
 				    _nc_visbuf(Strings[i])));
 	    } else {
-		if (!corrupt) {
-		    corrupt = TRUE;
-		    TR(TRACE_DATABASE,
-		       ("ignore out-of-range index %d to Strings[]", nn));
-		    _nc_warning("corrupt data found in convert_strings");
-		}
-		Strings[i] = ABSENT_STRING;
+		TR(TRACE_DATABASE,
+		   ("found out-of-range index %d to Strings[%d]", nn, i));
+		success = FALSE;
+		break;
 	    }
 	}
 
 	/* make sure all strings are NUL terminated */
 	if (VALID_STRING(Strings[i])) {
-	    for (p = Strings[i]; p <= table + size; p++)
+	    for (p = Strings[i]; p < table + size; p++)
 		if (*p == '\0')
 		    break;
 	    /* if there is no NUL, ignore the string */
-	    if (p > table + size)
+	    if (p >= table + size) {
 		Strings[i] = ABSENT_STRING;
+	    } else if (p == Strings[i] && always) {
+		TR(TRACE_DATABASE,
+		   ("found empty but required Strings[%d]", i));
+		success = FALSE;
+		break;
+	    }
+	} else if (always) {	/* names are always needed */
+	    TR(TRACE_DATABASE,
+	       ("found invalid but required Strings[%d]", i));
+	    success = FALSE;
+	    break;
 	}
     }
+    if (!success) {
+	_nc_warning("corrupt data found in convert_strings");
+    }
+    return success;
 }
 
 static int
@@ -380,7 +393,10 @@ _nc_read_termtype(TERMTYPE2 *ptr, char *
 	if (Read(string_table, (unsigned) str_size) != str_size) {
 	    returnDB(TGETENT_NO);
 	}
-	convert_strings(buf, ptr->Strings, str_count, str_size, string_table);
+	if (!convert_strings(buf, ptr->Strings, str_count, str_size,
+			     string_table, FALSE)) {
+	    returnDB(TGETENT_NO);
+	}
     }
 #if NCURSES_XNAMES
 
@@ -472,8 +488,10 @@ _nc_read_termtype(TERMTYPE2 *ptr, char *
 	    TR(TRACE_DATABASE,
 	       ("Before computing extended-string capabilities str_count=%d, ext_str_count=%d",
 		str_count, ext_str_count));
-	    convert_strings(buf, ptr->Strings + str_count, ext_str_count,
-			    ext_str_limit, ptr->ext_str_table);
+	    if (!convert_strings(buf, ptr->Strings + str_count, ext_str_count,
+				 ext_str_limit, ptr->ext_str_table, FALSE)) {
+		returnDB(TGETENT_NO);
+	    }
 	    for (i = ext_str_count - 1; i >= 0; i--) {
 		TR(TRACE_DATABASE, ("MOVE from [%d:%d] %s",
 				    i, i + str_count,
@@ -497,10 +515,13 @@ _nc_read_termtype(TERMTYPE2 *ptr, char *
 	    TR(TRACE_DATABASE,
 	       ("ext_NAMES starting @%d in extended_strings, first = %s",
 		base, _nc_visbuf(ptr->ext_str_table + base)));
-	    convert_strings(buf + (2 * ext_str_count),
-			    ptr->ext_Names,
-			    (int) need,
-			    ext_str_limit, ptr->ext_str_table + base);
+	    if (!convert_strings(buf + (2 * ext_str_count),
+				 ptr->ext_Names,
+				 (int) need,
+				 ext_str_limit, ptr->ext_str_table + base,
+				 TRUE)) {
+		returnDB(TGETENT_NO);
+	    }
 	}
 
 	TR(TRACE_DATABASE,