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From 6bb8aeb30a2686facc48733016caade97ece10ad Mon Sep 17 00:00:00 2001
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From: Povilas Kanapickas <povilas@radix.lt>
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Date: Tue, 14 Dec 2021 15:00:01 +0200
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Subject: [PATCH xserver 2/4] xfixes: Fix out of bounds access in
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*ProcXFixesCreatePointerBarrier()
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ZDI-CAN-14950, CVE-2021-4009
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This vulnerability was discovered and the fix was suggested by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
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(cherry picked from commit b5196750099ae6ae582e1f46bd0a6dad29550e02)
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---
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xfixes/cursor.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/xfixes/cursor.c b/xfixes/cursor.c
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index d4b68f3af..5f531a89a 100644
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--- a/xfixes/cursor.c
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+++ b/xfixes/cursor.c
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@@ -1010,7 +1010,8 @@ ProcXFixesCreatePointerBarrier(ClientPtr client)
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{
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REQUEST(xXFixesCreatePointerBarrierReq);
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- REQUEST_FIXED_SIZE(xXFixesCreatePointerBarrierReq, pad_to_int32(stuff->num_devices));
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+ REQUEST_FIXED_SIZE(xXFixesCreatePointerBarrierReq,
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+ pad_to_int32(stuff->num_devices * sizeof(CARD16)));
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LEGAL_NEW_RESOURCE(stuff->barrier, client);
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return XICreatePointerBarrier(client, stuff);
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@@ -1027,7 +1028,8 @@ SProcXFixesCreatePointerBarrier(ClientPtr client)
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swaps(&stuff->length);
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swaps(&stuff->num_devices);
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- REQUEST_FIXED_SIZE(xXFixesCreatePointerBarrierReq, pad_to_int32(stuff->num_devices));
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+ REQUEST_FIXED_SIZE(xXFixesCreatePointerBarrierReq,
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+ pad_to_int32(stuff->num_devices * sizeof(CARD16)));
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swapl(&stuff->barrier);
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swapl(&stuff->window);
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--
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2.33.1
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