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Unvalidated extra length in ProcEstablishConnection (CVE-2017-12176)

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Reviewed-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Nathan Kidd <nkidd@opentext.com>
Signed-off-by: Julien Cristau <jcristau@debian.org>
(cherry picked from commit b747da5e25)
This commit is contained in:
Nathan Kidd 2015-01-09 10:15:46 -05:00 committed by Adam Jackson
parent cc41e5b581
commit 95f605b42d
1 changed files with 6 additions and 1 deletions
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7
dix/dispatch.c
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@ -3703,7 +3703,12 @@ ProcEstablishConnection(ClientPtr client)
prefix = (xConnClientPrefix *) ((char *) stuff + sz_xReq);
auth_proto = (char *) prefix + sz_xConnClientPrefix;
auth_string = auth_proto + pad_to_int32(prefix->nbytesAuthProto);
if ((prefix->majorVersion != X_PROTOCOL) ||
if ((client->req_len << 2) != sz_xReq + sz_xConnClientPrefix +
pad_to_int32(prefix->nbytesAuthProto) +
pad_to_int32(prefix->nbytesAuthString))
reason = "Bad length";
else if ((prefix->majorVersion != X_PROTOCOL) ||
(prefix->minorVersion != X_PROTOCOL_REVISION))
reason = "Protocol version mismatch";
else