http://bugs.gentoo.org/239047

--- linux-ftpd-0.17/ftpd/extern.h
+++ linux-ftpd-0.17/ftpd/extern.h
@@ -43,7 +43,7 @@ void	dologout __P((int));
 void	fatal __P((const char *));
 int	ftpd_pclose __P((FILE *));
 FILE   *ftpd_popen __P((char *, const char *));
-char   *ftpd_getline __P((char *, int, FILE *));
+int	ftpd_getline __P((char *, int, FILE *));
 void	ftpdlogwtmp __P((const char *, const char *, const char *));
 void	lreply __P((int, const char *, ...));
 void	makedir __P((char *));
--- linux-ftpd-0.17/ftpd/ftpcmd.y
+++ linux-ftpd-0.17/ftpd/ftpcmd.y
@@ -980,7 +980,7 @@ static struct tab *lookup(struct tab *p,
 /*
  * getline - a hacked up version of fgets to ignore TELNET escape codes.
  */
-char * ftpd_getline(char *s, int n, FILE *iop)
+int ftpd_getline(char *s, int n, FILE *iop)
 {
 	int c;
 	register char *cs;
@@ -995,7 +995,7 @@ char * ftpd_getline(char *s, int n, FILE
 			if (debug)
 				syslog(LOG_DEBUG, "command: %s", s);
 			tmpline[0] = '\0';
-			return(s);
+			return(0);
 		}
 		if (c == 0)
 			tmpline[0] = '\0';
@@ -1037,11 +1037,22 @@ char * ftpd_getline(char *s, int n, FILE
 		    }
 		}
 		*cs++ = c;
-		if (--n <= 0 || c == '\n')
+		if (--n <= 0) {
+			/*
+			 * If command doesn't fit into buffer, discard the
+			 * rest of the command and indicate truncation.
+			 * This prevents the command to be split up into
+			 * multiple commands.
+			 */
+			while (c != '\n' && (c = getc(iop)) != EOF)
+				;
+			return (-2);
+		}
+		if (c == '\n')
 			break;
 	}
 	if (c == EOF && cs == s)
-		return (NULL);
+		return (-1);
 	*cs++ = '\0';
 	if (debug) {
 		if (!guest && strncasecmp("pass ", s, 5) == 0) {
@@ -1061,7 +1072,7 @@ char * ftpd_getline(char *s, int n, FILE
 			syslog(LOG_DEBUG, "command: %.*s", len, s);
 		}
 	}
-	return (s);
+	return (0);
 }
 
 void toolong(int signo)
@@ -1090,9 +1101,14 @@ static int yylex(void)
 		case CMD:
 			(void) signal(SIGALRM, toolong);
 			(void) alarm((unsigned) timeout);
-			if (ftpd_getline(cbuf, sizeof(cbuf)-1, stdin)==NULL) {
+			n = ftpd_getline(cbuf, sizeof(cbuf)-1, stdin);
+			if (n == -1) {
 				reply(221, "You could at least say goodbye.");
 				dologout(0);
+			} else if (n == -2) {
+				reply(500, "Command too long.");
+				alarm(0);
+				continue;
 			}
 			(void) alarm(0);
 			if ((cp = strchr(cbuf, '\r'))) {
--- linux-ftpd-0.17/ftpd/ftpd.c
+++ linux-ftpd-0.17/ftpd/ftpd.c
@@ -2210,6 +2210,7 @@ void dologout(int status)
 static void myoob(int signo)
 {
 	char *cp;
+	int ret;
 	int save_errno = errno;
 
 	(void)signo;
@@ -2218,9 +2219,13 @@ static void myoob(int signo)
 	if (!transflag)
 		return;
 	cp = tmpline;
-	if (ftpd_getline(cp, 7, stdin) == NULL) {
+	ret = ftpd_getline(cp, 7, stdin);
+	if (ret == -1) {
 		reply(221, "You could at least say goodbye.");
 		dologout(0);
+	} else if (ret == -2) {
+		/* Ignore truncated command */
+		return;
 	}
 	upper(cp);
 	if (strcmp(cp, "ABOR\r\n") == 0) {