36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
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From acc50e6097d51fec0c6c34d84c35018a50c52d5a 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 15:00:00 +0200
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Subject: [PATCH xserver 1/4] record: Fix out of bounds access in
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SwapCreateRegister()
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ZDI-CAN-14952, CVE-2021-4011
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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 e56f61c79fc3cee26d83cda0f84ae56d5979f768)
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---
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record/record.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/record/record.c b/record/record.c
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index 05d751ac2..a8aec23bd 100644
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--- a/record/record.c
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+++ b/record/record.c
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@@ -2515,8 +2515,8 @@ SwapCreateRegister(ClientPtr client, xRecordRegisterClientsReq * stuff)
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swapl(pClientID);
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}
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if (stuff->nRanges >
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- client->req_len - bytes_to_int32(sz_xRecordRegisterClientsReq)
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- - stuff->nClients)
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+ (client->req_len - bytes_to_int32(sz_xRecordRegisterClientsReq)
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+ - stuff->nClients) / bytes_to_int32(sz_xRecordRange))
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return BadLength;
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RecordSwapRanges((xRecordRange *) pClientID, stuff->nRanges);
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return Success;
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--
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2.33.1
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