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From 144849ea27230962227e62a943b399e2ab304787 Mon Sep 17 00:00:00 2001
From: Matthieu Herrb <matthieu@herrb.eu>
Date: Tue, 18 Aug 2020 14:52:29 +0200
Subject: [PATCH] Fix XkbSelectEvents() integer underflow
CVE-2020-14361 ZDI-CAN 11573
This vulnerability was discovered by:
Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
---
xkb/xkbSwap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xkb/xkbSwap.c b/xkb/xkbSwap.c
index 1c1ed5ff46..50cabb90e5 100644
--- a/xkb/xkbSwap.c
+++ b/xkb/xkbSwap.c
@@ -76,7 +76,7 @@ SProcXkbSelectEvents(ClientPtr client)
register unsigned bit, ndx, maskLeft, dataLeft, size;
from.c8 = (CARD8 *) &stuff[1];
- dataLeft = (stuff->length * 4) - SIZEOF(xkbSelectEventsReq);
+ dataLeft = (client->req_len * 4) - SIZEOF(xkbSelectEventsReq);
maskLeft = (stuff->affectWhich & (~XkbMapNotifyMask));
for (ndx = 0, bit = 1; (maskLeft != 0); ndx++, bit <<= 1) {
if (((bit & maskLeft) == 0) || (ndx == XkbMapNotify))
--
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