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<p class="MsoNormal"><span style="color:#1F497D">Mad can be deleted during failed send.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thus, the old code may access already de-allocated pointer.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Signed-off by: Alexander Naslednikov (xalex at mellanox.co.il)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Index: umad.cpp<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">===================================================================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">--- umad.cpp (revision 7570)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">+++ umad.cpp (revision 7571)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">@@ -613,11 +613,11 @@<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> umad_convert_addr(&mad->addr, &((WM_MAD *) mad)->Address);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> hr = ports[portid].prov->Send((WM_MAD *) mad, NULL);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">- umad_convert_av(&((WM_MAD *) mad)->Address, &mad->addr);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> if (FAILED(hr)) {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> _set_errno(EIO);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> return GetLastError();<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">+ umad_convert_av(&((WM_MAD *) mad)->Address, &mad->addr);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> return 0;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Alex Naslednikov
<br>
<b>Sent:</b> Tuesday, March 22, 2011 3:29 PM<br>
<b>To:</b> ofw@lists.openfabrics.org<br>
<b>Subject:</b> [ofw'[Patch][opensm] Avoid dangling reference<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:8.5pt;
font-family:"Courier New"">Do not use mad wrapper pointer after deleting it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Courier New"">The old code tried to access already de-allocated pointer, which caused to dangling reference<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Courier New"">Signed-off by: Alexander Naslednikov (xalex at mellanox.co.il)</span><o:p></o:p></p>
<p class="MsoNormal">Index: B:/users/xalex/MLNX_VPI_trunk/ulp/opensm/user/opensm/osm_vl15intf.c<o:p></o:p></p>
<p class="MsoNormal">===================================================================<o:p></o:p></p>
<p class="MsoNormal">--- B:/users/xalex/MLNX_VPI_trunk/ulp/opensm/user/opensm/osm_vl15intf.c (revision 7562)<o:p></o:p></p>
<p class="MsoNormal">+++ B:/users/xalex/MLNX_VPI_trunk/ulp/opensm/user/opensm/osm_vl15intf.c (revision 7563)<o:p></o:p></p>
<p class="MsoNormal">@@ -63,7 +63,8 @@<o:p></o:p></p>
<p class="MsoNormal"> since we can have no confirmation that they arrived<o:p></o:p></p>
<p class="MsoNormal"> at their destination.<o:p></o:p></p>
<p class="MsoNormal"> */<o:p></o:p></p>
<p class="MsoNormal">- if (p_madw->resp_expected == TRUE)<o:p></o:p></p>
<p class="MsoNormal">+ boolean_t resp_expected = p_madw->resp_expected;<o:p></o:p></p>
<p class="MsoNormal">+ if (resp_expected == TRUE)<o:p></o:p></p>
<p class="MsoNormal"> /*<o:p></o:p></p>
<p class="MsoNormal"> Note that other threads may not see the response MAD<o:p></o:p></p>
<p class="MsoNormal"> arrive before send() even returns.<o:p></o:p></p>
<p class="MsoNormal">@@ -103,7 +104,7 @@<o:p></o:p></p>
<p class="MsoNormal"> qp0_mads_outstanding will be decremented by send error callback<o:p></o:p></p>
<p class="MsoNormal"> (called by osm_vendor_send() */<o:p></o:p></p>
<p class="MsoNormal"> cl_atomic_dec(&p_vl->p_stats->qp0_mads_sent);<o:p></o:p></p>
<p class="MsoNormal">- if (!p_madw->resp_expected)<o:p></o:p></p>
<p class="MsoNormal">+ if (!resp_expected)<o:p></o:p></p>
<p class="MsoNormal"> cl_atomic_dec(&p_vl->p_stats->qp0_unicasts_sent);<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Alexander (XaleX) Naslednikov<o:p></o:p></b></p>
<p class="MsoNormal"><b>SW Networking Team<o:p></o:p></b></p>
<p class="MsoNormal"><b>Mellanox Technologies<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
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