--- /dev/null
+From 98ccabf68e5b3f0a177bd1925581753d10041448 Mon Sep 17 00:00:00 2001
+From: Simon Josefsson <simon@josefsson.org>
+Date: Wed, 1 Sep 2021 09:09:50 +0200
+Subject: [PATCH] ftp: check that PASV/LSPV addresses match.
+
+* NEWS: Mention change.
+* ftp/ftp.c (initconn): Validate returned addresses.
+
+CVE: CVE-2021-40491
+
+Upstream-Status: Backport
+[https://git.savannah.gnu.org/cgit/inetutils.git/commit/?id=58cb043b190fd04effdaea7c9403416b436e50dd]
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ NEWS | 9 +++++++++
+ ftp/ftp.c | 21 +++++++++++++++++++++
+ 2 files changed, 30 insertions(+)
+
+diff --git a/NEWS b/NEWS
+index 7c5e62c..bd9a4da 100644
+--- a/NEWS
++++ b/NEWS
+@@ -4,6 +4,15 @@ GNU inetutils NEWS -- history of user-visible changes.
+
+ ** ftp
+
++The ftp client now validate addresses returned by PASV/LSPV responses,
++to make sure they match the server address. Reported by ZeddYu Lu in
++<https://lists.gnu.org/archive/html/bug-inetutils/2021-06/msg00002.html>.
++
++Thanks to Luke Mewburn <lukem@netbsd.org> for discussion and fix to
++NetBSD code, we used a similar solution.
++
++** ftp
++
+ Disable use of readline when environment variable TERM is unset or set
+ to "dumb" (caused problems with Emacs AngeFTP on MacOS). Thanks to
+ Alex Bochannek for report, debugging and patch.
+diff --git a/ftp/ftp.c b/ftp/ftp.c
+index d21dbdd..7513539 100644
+--- a/ftp/ftp.c
++++ b/ftp/ftp.c
+@@ -1365,6 +1365,13 @@ initconn (void)
+ uint32_t *pu32 = (uint32_t *) &data_addr_sa4->sin_addr.s_addr;
+ pu32[0] = htonl ( (h[0] << 24) | (h[1] << 16) | (h[2] << 8) | h[3]);
+ }
++ if (data_addr_sa4->sin_addr.s_addr
++ != ((struct sockaddr_in *) &hisctladdr)->sin_addr.s_addr)
++ {
++ printf ("Passive mode address mismatch.\n");
++ (void) command ("ABOR"); /* Cancel any open connection. */
++ goto bad;
++ }
+ } /* LPSV IPv4 */
+ else /* IPv6 */
+ {
+@@ -1395,6 +1402,13 @@ initconn (void)
+ pu32[2] = htonl ( (h[8] << 24) | (h[9] << 16) | (h[10] << 8) | h[11]);
+ pu32[3] = htonl ( (h[12] << 24) | (h[13] << 16) | (h[14] << 8) | h[15]);
+ }
++ if (data_addr_sa6->sin6_addr.s6_addr
++ != ((struct sockaddr_in6 *) &hisctladdr)->sin6_addr.s6_addr)
++ {
++ printf ("Passive mode address mismatch.\n");
++ (void) command ("ABOR"); /* Cancel any open connection. */
++ goto bad;
++ }
+ } /* LPSV IPv6 */
+ }
+ else /* !EPSV && !LPSV */
+@@ -1415,6 +1429,13 @@ initconn (void)
+ | ((a2 & 0xff) << 8) | (a3 & 0xff) );
+ data_addr_sa4->sin_port =
+ htons (((p0 & 0xff) << 8) | (p1 & 0xff));
++ if (data_addr_sa4->sin_addr.s_addr
++ != ((struct sockaddr_in *) &hisctladdr)->sin_addr.s_addr)
++ {
++ printf ("Passive mode address mismatch.\n");
++ (void) command ("ABOR"); /* Cancel any open connection. */
++ goto bad;
++ }
+ } /* PASV */
+ else
+ {
+--
+2.17.1
+
