freerdp3: fix CVE-2026-24491

Details: https://nvd.nist.gov/vuln/detail/CVE-2026-24491

Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>

2 files changed, 53 insertions, 0 deletions

diff --git a/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-24491.patch b/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-24491.patch
new file mode 100644
index 0000000000..958d030bfd
--- /dev/null
+++ b/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-24491.patch
@@ -0,0 +1,52 @@
+From ef948ef4659f59c10a71083fa8cb5d5da77e94a9 Mon Sep 17 00:00:00 2001
+From: akallabeth <akallabeth@posteo.net>
+Date: Mon, 26 Jan 2026 10:06:29 +0100
+Subject: [PATCH] [channels,drdynvc] reset channel_callback before close
+
+The channel_callback usually frees up the memory of the callback. To
+ensure that there is no access to any of the data structures in it
+invalidate the pointer used to access it before a free.
+
+CVE: CVE-2026-24491
+Upstream-Status: Backport [https://github.com/FreeRDP/FreeRDP/commit/e02e052f6692550e539d10f99de9c35a23492db2]
+Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
+---
+ channels/drdynvc/client/drdynvc_main.c | 6 ++----
+ 1 file changed, 2 insertions(+), 4 deletions(-)
+
+diff --git a/channels/drdynvc/client/drdynvc_main.c b/channels/drdynvc/client/drdynvc_main.c
+index 0b85c0fe3..64c83333a 100644
+--- a/channels/drdynvc/client/drdynvc_main.c
++++ b/channels/drdynvc/client/drdynvc_main.c
+@@ -485,14 +485,13 @@ static UINT dvcman_channel_close(DVCMAN_CHANNEL* channel, BOOL perRequest, BOOL
+                        channel->state = DVC_CHANNEL_CLOSED;
+ 
+                        IWTSVirtualChannelCallback* cb = channel->channel_callback;
++                       channel->channel_callback = NULL;
+                        if (cb)
+                        {
+                                check_open_close_receive(channel);
+                                IFCALL(cb->OnClose, cb);
+                        }
+ 
+-                       channel->channel_callback = NULL;
+-
+                        if (channel->dvcman && channel->dvcman->drdynvc)
+                        {
+                                if (context)
+@@ -763,14 +762,13 @@ out:
+  */
+ static UINT dvcman_open_channel(drdynvcPlugin* drdynvc, DVCMAN_CHANNEL* channel)
+ {
+-       IWTSVirtualChannelCallback* pCallback = NULL;
+        UINT error = CHANNEL_RC_OK;
+ 
+        WINPR_ASSERT(drdynvc);
+        WINPR_ASSERT(channel);
+        if (channel->state == DVC_CHANNEL_RUNNING)
+        {
+-               pCallback = channel->channel_callback;
++               IWTSVirtualChannelCallback* pCallback = channel->channel_callback;
+ 
+                if (pCallback->OnOpen)
+                {
diff --git a/meta-oe/recipes-support/freerdp/freerdp3_3.4.0.bb b/meta-oe/recipes-support/freerdp/freerdp3_3.4.0.bb
index c570e5fb7e..e66a4ed4da 100644
--- a/meta-oe/recipes-support/freerdp/freerdp3_3.4.0.bb
+++ b/meta-oe/recipes-support/freerdp/freerdp3_3.4.0.bb
@@ -23,6 +23,7 @@ SRC_URI = "git://github.com/FreeRDP/FreeRDP.git;branch=master;protocol=https \
            file://CVE-2026-25941.patch \
            file://CVE-2026-33952.patch \
            file://CVE-2026-23948.patch \
+           file://CVE-2026-24491.patch \
            "
 
 S = "${WORKDIR}/git"