xwayland: Fix CVE-2025-26598

Upstream-Status: Backport from https://gitlab.freedesktop.org/xorg/xserver/-/commit/bba9df1a

(From OE-Core rev: b58fe3b82168502e29f500e42ca8d140934f5b1a)

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 121 insertions, 0 deletions

diff --git a/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26598.patch b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26598.patch
new file mode 100644
index 0000000000..210a76262a
--- /dev/null
+++ b/meta/recipes-graphics/xwayland/xwayland/CVE-2025-26598.patch
@@ -0,0 +1,120 @@
+From bba9df1a9d57234c76c0b93f88dacb143d01bca2 Mon Sep 17 00:00:00 2001
+From: Olivier Fourdan <ofourdan@redhat.com>
+Date: Mon, 16 Dec 2024 11:25:11 +0100
+Subject: [PATCH] Xi: Fix barrier device search
+
+The function GetBarrierDevice() would search for the pointer device
+based on its device id and return the matching value, or supposedly NULL
+if no match was found.
+
+Unfortunately, as written, it would return the last element of the list
+if no matching device id was found which can lead to out of bounds
+memory access.
+
+Fix the search function to return NULL if not matching device is found,
+and adjust the callers to handle the case where the device cannot be
+found.
+
+CVE-2025-26598, ZDI-CAN-25740
+
+This vulnerability was discovered by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
+Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
+Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1828>
+
+Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/bba9df1a]
+CVE: CVE-2025-26598
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ Xi/xibarriers.c | 27 +++++++++++++++++++++++----
+ 1 file changed, 23 insertions(+), 4 deletions(-)
+
+diff --git a/Xi/xibarriers.c b/Xi/xibarriers.c
+index 700b2b8c53..6761bcb49a 100644
+--- a/Xi/xibarriers.c
++++ b/Xi/xibarriers.c
+@@ -132,14 +132,15 @@ static void FreePointerBarrierClient(struct PointerBarrierClient *c)
+ 
+ static struct PointerBarrierDevice *GetBarrierDevice(struct PointerBarrierClient *c, int deviceid)
+ {
+-    struct PointerBarrierDevice *pbd = NULL;
++    struct PointerBarrierDevice *p, *pbd = NULL;
+ 
+-    xorg_list_for_each_entry(pbd, &c->per_device, entry) {
+-        if (pbd->deviceid == deviceid)
++    xorg_list_for_each_entry(p, &c->per_device, entry) {
++        if (p->deviceid == deviceid) {
++            pbd = p;
+             break;
++        }
+     }
+ 
+-    BUG_WARN(!pbd);
+     return pbd;
+ }
+ 
+@@ -340,6 +341,9 @@ barrier_find_nearest(BarrierScreenPtr cs, DeviceIntPtr dev,
+         double distance;
+ 
+         pbd = GetBarrierDevice(c, dev->id);
++        if (!pbd)
++            continue;
++
+         if (pbd->seen)
+             continue;
+ 
+@@ -448,6 +452,9 @@ input_constrain_cursor(DeviceIntPtr dev, ScreenPtr screen,
+         nearest = &c->barrier;
+ 
+         pbd = GetBarrierDevice(c, master->id);
++        if (!pbd)
++            continue;
++
+         new_sequence = !pbd->hit;
+ 
+         pbd->seen = TRUE;
+@@ -488,6 +495,9 @@ input_constrain_cursor(DeviceIntPtr dev, ScreenPtr screen,
+         int flags = 0;
+ 
+         pbd = GetBarrierDevice(c, master->id);
++        if (!pbd)
++            continue;
++
+         pbd->seen = FALSE;
+         if (!pbd->hit)
+             continue;
+@@ -682,6 +692,9 @@ BarrierFreeBarrier(void *data, XID id)
+             continue;
+ 
+         pbd = GetBarrierDevice(c, dev->id);
++        if (!pbd)
++            continue;
++
+         if (!pbd->hit)
+             continue;
+ 
+@@ -741,6 +754,8 @@ static void remove_master_func(void *res, XID id, void *devid)
+     barrier = container_of(b, struct PointerBarrierClient, barrier);
+ 
+     pbd = GetBarrierDevice(barrier, *deviceid);
++    if (!pbd)
++        return;
+ 
+     if (pbd->hit) {
+         BarrierEvent ev = {
+@@ -905,6 +920,10 @@ ProcXIBarrierReleasePointer(ClientPtr client)
+         barrier = container_of(b, struct PointerBarrierClient, barrier);
+ 
+         pbd = GetBarrierDevice(barrier, dev->id);
++        if (!pbd) {
++            client->errorValue = dev->id;
++            return BadDevice;
++        }
+ 
+         if (pbd->barrier_event_id == event_id)
+             pbd->release_event_id = event_id;
+-- 
+GitLab
+
diff --git a/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb b/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
index 7f94c5e2e2..b46a02e5c3 100644
--- a/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
+++ b/meta/recipes-graphics/xwayland/xwayland_23.2.5.bb
@@ -16,6 +16,7 @@ SRC_URI = "https://www.x.org/archive/individual/xserver/xwayland-${PV}.tar.xz \
            file://CVE-2025-26595.patch \
            file://CVE-2025-26596.patch \
            file://CVE-2025-26597.patch \
+           file://CVE-2025-26598.patch \
 "
 SRC_URI[sha256sum] = "33ec7ff2687a59faaa52b9b09aa8caf118e7ecb6aed8953f526a625ff9f4bd90"