31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From c940cc8b6c0a2983c1ec974f1b3f019795dd4cff Mon Sep 17 00:00:00 2001
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From: Matthieu Herrb <matthieu@herrb.eu>
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Date: Tue, 18 Aug 2020 14:49:04 +0200
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Subject: [PATCH] Fix XIChangeHierarchy() integer underflow
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CVE-2020-14346 / ZDI-CAN-11429
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reference：https://gitlab.freedesktop.org/xorg/xserver/-/commit/c940cc8b6c0a2983c1ec974f1b3f019795dd4cff
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
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---
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Xi/xichangehierarchy.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/Xi/xichangehierarchy.c b/Xi/xichangehierarchy.c
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index cbdd912..504defe 100644
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--- a/Xi/xichangehierarchy.c
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+++ b/Xi/xichangehierarchy.c
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@@ -423,7 +423,7 @@ ProcXIChangeHierarchy(ClientPtr client)
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if (!stuff->num_changes)
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return rc;
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- len = ((size_t)stuff->length << 2) - sizeof(xXIChangeHierarchyReq);
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+ len = ((size_t)client->req_len << 2) - sizeof(xXIChangeHierarchyReq);
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any = (xXIAnyHierarchyChangeInfo *) &stuff[1];
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while (stuff->num_changes--) {
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--
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2.27.0
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