Fix for CVE-2023-50495 from upstream:
https://github.com/ThomasDickey/ncurses-snapshots/commit/efe9674ee14b14b788f9618941f97d31742f0adc

Reference:
https://invisible-island.net/archives/ncurses/6.4/ncurses-6.4-20230424.patch.gz

Upstream-Status: Backport [import from suse ftp.pbone.net/mirror/ftp.opensuse.org/update/leap-micro/5.3/sle/src/ncurses-6.1-150000.5.20.1.src.rpm
Upstream commit https://github.com/ThomasDickey/ncurses-snapshots/commit/efe9674ee14b14b788f9618941f97d31742f0adc]
CVE: CVE-2023-50495
Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
---
 ncurses/tinfo/parse_entry.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/ncurses/tinfo/parse_entry.c b/ncurses/tinfo/parse_entry.c
index 23574b66..56ba9ae6 100644
--- a/ncurses/tinfo/parse_entry.c
+++ b/ncurses/tinfo/parse_entry.c
@@ -110,7 +110,7 @@ _nc_extend_names(ENTRY * entryp, const char *name, int token_type)
 	/* Well, we are given a cancel for a name that we don't recognize */
 	return _nc_extend_names(entryp, name, STRING);
     default:
-	return 0;
+	return NULL;
     }
 
     /* Adjust the 'offset' (insertion-point) to keep the lists of extended
@@ -142,6 +142,11 @@ _nc_extend_names(ENTRY * entryp, const char *name, int token_type)
 	for (last = (unsigned) (max - 1); last > tindex; last--)
 
     if (!found) {
+	char *saved;
+
+	if ((saved = _nc_save_str(name)) == NULL)
+	    return NULL;
+
 	switch (token_type) {
 	case BOOLEAN:
 	    tp->ext_Booleans++;
@@ -169,7 +174,7 @@ _nc_extend_names(ENTRY * entryp, const char *name, int token_type)
 	TYPE_REALLOC(char *, actual, tp->ext_Names);
 	while (--actual > offset)
 	    tp->ext_Names[actual] = tp->ext_Names[actual - 1];
-	tp->ext_Names[offset] = _nc_save_str(name);
+	tp->ext_Names[offset] = saved;
     }
 
     temp.nte_name = tp->ext_Names[offset];
@@ -337,6 +342,8 @@ _nc_parse_entry(ENTRY * entryp, int literal, bool silent)
 	bool is_use = (strcmp(_nc_curr_token.tk_name, "use") == 0);
 	bool is_tc = !is_use && (strcmp(_nc_curr_token.tk_name, "tc") == 0);
 	if (is_use || is_tc) {
+	    char *saved;
+
 	    if (!VALID_STRING(_nc_curr_token.tk_valstring)
 		|| _nc_curr_token.tk_valstring[0] == '\0') {
 		_nc_warning("missing name for use-clause");
@@ -350,11 +357,13 @@ _nc_parse_entry(ENTRY * entryp, int literal, bool silent)
 			    _nc_curr_token.tk_valstring);
 		continue;
 	    }
-	    entryp->uses[entryp->nuses].name = _nc_save_str(_nc_curr_token.tk_valstring);
-	    entryp->uses[entryp->nuses].line = _nc_curr_line;
-	    entryp->nuses++;
-	    if (entryp->nuses > 1 && is_tc) {
-		BAD_TC_USAGE
+	    if ((saved = _nc_save_str(_nc_curr_token.tk_valstring)) != NULL) {
+		entryp->uses[entryp->nuses].name = saved;
+		entryp->uses[entryp->nuses].line = _nc_curr_line;
+		entryp->nuses++;
+		if (entryp->nuses > 1 && is_tc) {
+		    BAD_TC_USAGE
+		}
 	    }
 	} else {
 	    /* normal token lookup */
-- 
2.25.1