File krb5-appl-CVE-2022-39028.patch of Package krb5-appl.26157

Index: krb5-appl-1.0.3/telnet/telnetd/state.c
===================================================================
--- krb5-appl-1.0.3.orig/telnet/telnetd/state.c
+++ krb5-appl-1.0.3/telnet/telnetd/state.c
@@ -227,16 +227,22 @@ gotiac:			switch (c) {
 			case EC:
 			case EL:
 			    {
-				cc_t ch;
+				cc_t ch = (cc_t) (_POSIX_VDISABLE);
 
 				DIAG(TD_OPTIONS,
 					printoption("td: recv IAC", c));
 				ptyflush();	/* half-hearted */
 				init_termbuf();
 				if (c == EC)
-					ch = *slctab[SLC_EC].sptr;
+				  {
+				    if (slctab[SLC_EC].sptr)
+				      ch = *slctab[SLC_EC].sptr;
+				  }
 				else
-					ch = *slctab[SLC_EL].sptr;
+				  {
+				    if (slctab[SLC_EL].sptr)
+				      ch = *slctab[SLC_EL].sptr;
+				  }
 				if (ch != (cc_t)(_POSIX_VDISABLE))
 					*pfrontp++ = (unsigned char)ch;
 				break;