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Fix XIChangeHierarchy() integer underflow 

CVE-2020-14346 / ZDI-CAN-11429

This vulnerability was discovered by:
Jan-Niklas Sohn working with Trend Micro Zero Day Initiative

Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
This commit is contained in:
Matthieu Herrb 2020-08-18 14:49:04 +02:00
parent f7cd1276bb
commit c940cc8b6c
1 changed files with 1 additions and 1 deletions
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2
Xi/xichangehierarchy.c
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@ -423,7 +423,7 @@ ProcXIChangeHierarchy(ClientPtr client)
if (!stuff->num_changes)
return rc;
len = ((size_t)stuff->length << 2) - sizeof(xXIChangeHierarchyReq);
len = ((size_t)client->req_len << 2) - sizeof(xXIChangeHierarchyReq);
any = (xXIAnyHierarchyChangeInfo *) &stuff[1];
while (stuff->num_changes--) {