diff -Nru connman-1.41/debian/changelog connman-1.41/debian/changelog
--- connman-1.41/debian/changelog	2022-08-19 05:20:06.000000000 +0000
+++ connman-1.41/debian/changelog	2023-04-14 09:45:14.000000000 +0000
@@ -1,3 +1,9 @@
+connman (1.41-3) unstable; urgency=medium
+
+  * gdhcp: Verify and sanitize packet length first (CVE-2023-28488)
+
+ -- Vignesh Raman <vignesh.raman@collabora.com>  Fri, 14 Apr 2023 15:15:14 +0530
+
 connman (1.41-2) unstable; urgency=medium
 
   * d/patches: (Closes: #1016976)
diff -Nru connman-1.41/debian/patches/gdhcp-Verify-and-sanitize-packet-length-first.patch connman-1.41/debian/patches/gdhcp-Verify-and-sanitize-packet-length-first.patch
--- connman-1.41/debian/patches/gdhcp-Verify-and-sanitize-packet-length-first.patch	1970-01-01 00:00:00.000000000 +0000
+++ connman-1.41/debian/patches/gdhcp-Verify-and-sanitize-packet-length-first.patch	2023-04-14 09:45:14.000000000 +0000
@@ -0,0 +1,58 @@
+From 99e2c16ea1cced34a5dc450d76287a1c3e762138 Mon Sep 17 00:00:00 2001
+From: Daniel Wagner <wagi@monom.org>
+Date: Tue, 11 Apr 2023 08:12:56 +0200
+Subject: [PATCH] gdhcp: Verify and sanitize packet length first
+
+Avoid overwriting the read packet length after the initial test. Thus
+move all the length checks which depends on the total length first
+and do not use the total lenght from the IP packet afterwards.
+
+Fixes CVE-2023-28488
+
+Reported by Polina Smirnova <moe.hwr@gmail.com>
+---
+ gdhcp/client.c | 16 +++++++++-------
+ 1 file changed, 9 insertions(+), 7 deletions(-)
+
+diff --git a/gdhcp/client.c b/gdhcp/client.c
+index 7efa7e45..82017692 100644
+--- a/gdhcp/client.c
++++ b/gdhcp/client.c
+@@ -1319,9 +1319,9 @@ static bool sanity_check(struct ip_udp_dhcp_packet *packet, int bytes)
+ static int dhcp_recv_l2_packet(struct dhcp_packet *dhcp_pkt, int fd,
+ 				struct sockaddr_in *dst_addr)
+ {
+-	int bytes;
+ 	struct ip_udp_dhcp_packet packet;
+ 	uint16_t check;
++	int bytes, tot_len;
+ 
+ 	memset(&packet, 0, sizeof(packet));
+ 
+@@ -1329,15 +1329,17 @@ static int dhcp_recv_l2_packet(struct dhcp_packet *dhcp_pkt, int fd,
+ 	if (bytes < 0)
+ 		return -1;
+ 
+-	if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp)))
+-		return -1;
+-
+-	if (bytes < ntohs(packet.ip.tot_len))
++	tot_len = ntohs(packet.ip.tot_len);
++	if (bytes > tot_len) {
++		/* ignore any extra garbage bytes */
++		bytes = tot_len;
++	} else if (bytes < tot_len) {
+ 		/* packet is bigger than sizeof(packet), we did partial read */
+ 		return -1;
++	}
+ 
+-	/* ignore any extra garbage bytes */
+-	bytes = ntohs(packet.ip.tot_len);
++	if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp)))
++		return -1;
+ 
+ 	if (!sanity_check(&packet, bytes))
+ 		return -1;
+-- 
+2.30.2
+
diff -Nru connman-1.41/debian/patches/series connman-1.41/debian/patches/series
--- connman-1.41/debian/patches/series	2022-08-19 05:20:06.000000000 +0000
+++ connman-1.41/debian/patches/series	2023-04-14 09:45:14.000000000 +0000
@@ -3,3 +3,4 @@
 wispr-Add-reference-counter-to-portal-context.patch
 wispr-Update-portal-context-references.patch
 gweb-Fix-OOB-write-in-received_data.patch
+gdhcp-Verify-and-sanitize-packet-length-first.patch