[Xcb] [Bug 20665] New: xcb_auth.c doesn' t treat ipv6-mapped ipv4-addresses correctly

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=20665

           Summary: xcb_auth.c doesn't treat ipv6-mapped ipv4-addresses
                    correctly
           Product: XCB
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Library
        AssignedTo: xcb at lists.freedesktop.org
        ReportedBy: christophpfister at gmail.com


from irc:

<no_where> I believe I have found a bug in libxcb: src/xcb_auth.c. Line 190
reads:
<no_where>     APPEND(info->data, j, si6->sin6_addr.s6_addr[12]);
<no_where> As far as I can see, this will copy exactly one byte, because
sizeof(si6->sin6_addr.s6_addr[12]) is 1. But it should copy four bytes, namely
the IPv6-mapped IPv4-address from bytes 12 through 15.
<no_where> Can some knowledgable person confirm this, and if this analysis is
correct, file a bug report?
<christoph4> no_where: hmm, your statement makes sense
<no_where> christoph4: at least in the old libX11/.../ConnDis.c, 4 bytes were
copied explicitly

i've checked the xcb_auth.c code of current git head, and it matches the
description


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