File U_0004-Fix-XRecordRegisterClients-Integer-underflow.patch of Package xorg-x11-server.16372
From 2902b78535ecc6821cc027351818b28a5c7fdbdc Mon Sep 17 00:00:00 2001
From: Matthieu Herrb <matthieu@herrb.eu>
Date: Tue, 18 Aug 2020 14:55:01 +0200
Subject: [PATCH 4/4] Fix XRecordRegisterClients() Integer underflow
CVE-2020-14362 ZDI-CAN-11574
This vulnerability was discovered by:
Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
---
record/record.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
Index: xserver-1.20.8+0/record/record.c
===================================================================
--- xserver-1.20.8+0.orig/record/record.c
+++ xserver-1.20.8+0/record/record.c
@@ -2499,7 +2499,7 @@ SProcRecordQueryVersion(ClientPtr client
} /* SProcRecordQueryVersion */
static int _X_COLD
-SwapCreateRegister(xRecordRegisterClientsReq * stuff)
+SwapCreateRegister(ClientPtr client, xRecordRegisterClientsReq * stuff)
{
int i;
XID *pClientID;
@@ -2509,13 +2509,13 @@ SwapCreateRegister(xRecordRegisterClient
swapl(&stuff->nRanges);
pClientID = (XID *) &stuff[1];
if (stuff->nClients >
- stuff->length - bytes_to_int32(sz_xRecordRegisterClientsReq))
+ client->req_len - bytes_to_int32(sz_xRecordRegisterClientsReq))
return BadLength;
for (i = 0; i < stuff->nClients; i++, pClientID++) {
swapl(pClientID);
}
if (stuff->nRanges >
- stuff->length - bytes_to_int32(sz_xRecordRegisterClientsReq)
+ client->req_len - bytes_to_int32(sz_xRecordRegisterClientsReq)
- stuff->nClients)
return BadLength;
RecordSwapRanges((xRecordRange *) pClientID, stuff->nRanges);
@@ -2530,7 +2530,7 @@ SProcRecordCreateContext(ClientPtr clien
swaps(&stuff->length);
REQUEST_AT_LEAST_SIZE(xRecordCreateContextReq);
- if ((status = SwapCreateRegister((void *) stuff)) != Success)
+ if ((status = SwapCreateRegister(client, (void *) stuff)) != Success)
return status;
return ProcRecordCreateContext(client);
} /* SProcRecordCreateContext */
@@ -2543,7 +2543,7 @@ SProcRecordRegisterClients(ClientPtr cli
swaps(&stuff->length);
REQUEST_AT_LEAST_SIZE(xRecordRegisterClientsReq);
- if ((status = SwapCreateRegister((void *) stuff)) != Success)
+ if ((status = SwapCreateRegister(client, (void *) stuff)) != Success)
return status;
return ProcRecordRegisterClients(client);
} /* SProcRecordRegisterClients */