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54 lines
1.7 KiB
54 lines
1.7 KiB
11 months ago
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From 1a5e3c3e68d4f965077ea6a40ba57cc0d5a4e8cb Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Fri, 5 Jan 2024 09:40:27 +1000
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Subject: [PATCH xserver] dix: when disabling a master, float disabled slaved
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devices too
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Disabling a master device floats all slave devices but we didn't do this
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to already-disabled slave devices. As a result those devices kept their
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reference to the master device resulting in access to already freed
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memory if the master device was removed before the corresponding slave
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device.
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And to match this behavior, also forcibly reset that pointer during
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CloseDownDevices().
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Related to CVE-2024-21886, ZDI-CAN-22840
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---
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dix/devices.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/dix/devices.c b/dix/devices.c
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index c7fa8fad69..87f4d4a213 100644
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--- a/dix/devices.c
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+++ b/dix/devices.c
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@@ -482,6 +482,13 @@ DisableDevice(DeviceIntPtr dev, BOOL sendevent)
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flags[other->id] |= XISlaveDetached;
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}
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}
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+
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+ for (other = inputInfo.off_devices; other; other = other->next) {
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+ if (!IsMaster(other) && GetMaster(other, MASTER_ATTACHED) == dev) {
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+ AttachDevice(NULL, other, NULL);
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+ flags[other->id] |= XISlaveDetached;
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+ }
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+ }
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}
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else {
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for (other = inputInfo.devices; other; other = other->next) {
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@@ -1088,6 +1095,11 @@ CloseDownDevices(void)
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dev->master = NULL;
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}
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+ for (dev = inputInfo.off_devices; dev; dev = dev->next) {
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+ if (!IsMaster(dev) && !IsFloating(dev))
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+ dev->master = NULL;
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+ }
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+
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CloseDeviceList(&inputInfo.devices);
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CloseDeviceList(&inputInfo.off_devices);
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--
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2.43.0
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