freerdp3: fix CVE-2026-29776

Details: https://nvd.nist.gov/vuln/detail/CVE-2026-29776

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

2 files changed, 31 insertions, 0 deletions

diff --git a/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-29776.patch b/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-29776.patch
new file mode 100644
index 0000000000..0ab2114670
--- /dev/null
+++ b/meta-oe/recipes-support/freerdp/freerdp3/CVE-2026-29776.patch
@@ -0,0 +1,30 @@
+From 145c0c5f048894e4a7d09a4465eab7551f035bb0 Mon Sep 17 00:00:00 2001
+From: Armin Novak <armin.novak@thincast.com>
+Date: Tue, 3 Mar 2026 13:58:09 +0100
+Subject: [PATCH] [core,orders] improve input validation
+
+check length before subtracting. Might underflow and be cought by the
+next check, but lets be strict.
+
+(cherry picked from commit a9e0abf2eac8c2e370fa155bf1abb9d044c0ca8a)
+
+CVE: CVE-2026-29776
+Upstream-Status: Backport [https://github.com/FreeRDP/FreeRDP/commit/a9e0abf2eac8c2e370fa155bf1abb9d044c0ca8a]
+Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
+---
+ libfreerdp/core/orders.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/libfreerdp/core/orders.c b/libfreerdp/core/orders.c
+index 855b700ac..a9d779418 100644
+--- a/libfreerdp/core/orders.c
++++ b/libfreerdp/core/orders.c
+@@ -2214,6 +2214,8 @@ static CACHE_BITMAP_ORDER* update_read_cache_bitmap_order(rdpUpdate* update, wSt
+                                goto fail;
+ 
+                        Stream_Read(s, bitmapComprHdr, 8); /* bitmapComprHdr (8 bytes) */
++                       if (cache_bitmap->bitmapLength < 8)
++                               goto fail;
+                        cache_bitmap->bitmapLength -= 8;
+                }
+        }
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 e3d71ee854..74f80ee948 100644
--- a/meta-oe/recipes-support/freerdp/freerdp3_3.4.0.bb
+++ b/meta-oe/recipes-support/freerdp/freerdp3_3.4.0.bb
@@ -33,6 +33,7 @@ SRC_URI = "git://github.com/FreeRDP/FreeRDP.git;branch=master;protocol=https \
            file://CVE-2026-24683.patch \
            file://CVE-2026-29774.patch \
            file://CVE-2026-29775.patch \
+           file://CVE-2026-29776.patch \
            "
 
 S = "${WORKDIR}/git"