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Subject: RE: dmalloc question
Date: Wed, 10 Oct 2007 15:39:21 -0800
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E05EF1450@onstor-exch02.onstor.net>
In-Reply-To: <BB375AF679D4A34E9CA8DFA650E2B04E030E38E1@onstor-exch02.onstor.net>
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Thread-Topic: dmalloc question
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References: <BB375AF679D4A34E9CA8DFA650E2B04E030E38E1@onstor-exch02.onstor.net>
From: "Maxim Kozlovsky" <maxim.kozlovsky@onstor.com>
To: "Mike Lee" <mike.lee@onstor.com>,
	"dl-Cougar" <dl-Cougar@onstor.com>

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The error must be not on the target of the memcpy but on the source.

In my build, this is reproducible by doing "cifs share create"

_____________________________________________
From: Mike Lee=20
Sent: Wednesday, October 10, 2007 4:31 PM
To: dl-Cougar
Subject: dmalloc question

To the software members of the team:

Concerning the dmalloc error from eventd that Max collected...

The dmalloc log indicates the following:
1192040788: 3426: process pid =3D 1816
1192040788: 3426:   error details: pointer-check
1192040788: 3426:   pointer '0x2aaeec78' from 'unknown' prev access
'rmc_api.c:2061'
1192040788: 3426: ERROR: memcpy: use of pointer would exceed allocation
(err 28)

While the stack frames of interest from the corresponding eventd core
are:
#8  0x2b581134 in _dmalloc_memcpy (file=3D0x40dc80 "event.c", =
line=3D591,
to=3D0x2aae1078, from=3D0x2aaeec78, len=3D1248) at arg_check.c:251
#9  0x00403be8 in rmc_async_send (sess=3D0x484aa0, buf=3D0x2aaeec78,
bufsz=3D1248, tag=3D0, rpc_id=3D0, mode=3D8) at event.c:591
#10 0x00404638 in event_forwardToLocalApps (eventMsg=3D0x2aaeec78,
eventId=3D36) at event.c:719

Focusing on Frame 9 where the memcpy() call resides:
event.c, rmc_async_send()
    578 rmc_async_send(evt_rmc_session_t *sess, void *buf, ssize_t
bufsz,
    579                    uint32_t tag, uint32_t rpc_id, uint32_t mode)
    580 {
:
    585     msg =3D (rmc_msg_t *)rmc_alloc_msg(bufsz);
    586     if (msg =3D=3D NULL) {
    587         ASSERT(0);
    588         return RMC_NOMEM;
    589     }
    590
    591     memcpy(msg->sg_list[0].buf, buf, bufsz);

It would appear that perhaps rmc_alloc_msg() is not allocating enough.
However, my review of rmc_alloc_msg(), with help from Rendell, did not
identify any problem.
   2054 API rmc_msg_t *
   2055 rmc_alloc_msg(int32 sz)
   2056 {
   2057     rmc_msg_t *msg;
   2058=20
   2059     if (!(msg =3D (rmc_msg_t *)calloc(sizeof(rmc_msg_t) + sz, =
1)))
{
   2060         //return NULL;
   2061         // May be leaking memory.  Abort and let pm restart the
daemons.
   2062         abort();
   2063     }
   2064=20
   2065     if (sz) {
   2066         msg->sg_cnt =3D 1;
   2067         msg->sg_list[0].buf =3D ((char *)msg + =
sizeof(rmc_msg_t));
<=3D=3D=3D=3D=3D=3D=3D I think this setting is okay, though =
unconventional
   2068         msg->sg_list[0].len =3D sz;
   2069         msg->ihdr.msg_len =3D sz;
   2070=20
   2071     } else {
   2072         msg->sg_cnt =3D 0;
   2073         msg->ihdr.msg_len =3D 0;
   2074     }
   2075=20
   2076     /* JTOF - we set the type here (negative for RMC) so apps
know
   2077      * if they did the alloc or the RMC layer did. It's not
checked
   2078      * by the free routine because we alloc mallocs - if/when a=20
   2079      * pre-allocated list is added, this flag will be used to=20
   2080      * mark these messages
   2081      */
   2082     msg->memtyp =3D -1;
   2083     return msg;
   2084 }

Though the single call to calloc() is a little unusual, I don't see a
problem with this efficient logic.
So, my question is: could dmalloc report false-positives?
Also, should I break this calloc call into two calls (one for msg and
the other for buf), for sake of clarity?

Thanks.

-Mike

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<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">The error</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Arial">must be</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Arial">not on the target of the memcpy but on the =
source.</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">In my build, =
t</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">his is =
reproduc</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">ible by =
doing</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> =
<FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Arial">&#8220;</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">cifs =
share create</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Arial">&#8221;</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 =
FACE=3D"Tahoma">_____________________________________________<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">From:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Mike Lee<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Sent:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Wednesday, October 10, =
2007 4:31 PM<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">To:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> dl-Cougar<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Subject:</FONT></B></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma"> dmalloc question</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Arial">To the software members of the =
team:</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Concerning the dmalloc error from eventd that Max =
collected...</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">The =
dmalloc log indicates the following:</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">1192040788: 3426: process pid =3D 1816</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">1192040788: 3426:&nbsp;&nbsp; error details: =
pointer-check</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">1192040788: 3426:&nbsp;&nbsp; pointer '0x2aaeec78' from =
'unknown' prev access 'rmc_api.c:2061'</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">1192040788: 3426: ERROR: memcpy: use of pointer would =
exceed allocation (err 28)</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">While =
the stack frames of interest from the corresponding eventd core =
are:</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">#8&nbsp; =
0x2b581134 in _dmalloc_memcpy (file=3D0x40dc80 &quot;event.c&quot;, =
line=3D591, to=3D0x2aae1078, from=3D0x2aaeec78, len=3D1248) at =
arg_check.c:251</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">#9&nbsp; =
0x00403be8 in rmc_async_send (sess=3D0x484aa0, buf=3D0x2aaeec78, =
bufsz=3D1248, tag=3D0, rpc_id=3D0, mode=3D8) at =
event.c:591</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">#10 =
0x00404638 in event_forwardToLocalApps (eventMsg=3D0x2aaeec78, =
eventId=3D36) at event.c:719</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Focusing =
on Frame 9 where the memcpy() call resides:</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">event.c, =
rmc_async_send()</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; 578 rmc_async_send(evt_rmc_session_t =
*sess, void *buf, ssize_t bufsz,</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; =
579&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; uint32_t tag, uint32_t =
rpc_id, uint32_t mode)</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; 580 {</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">:</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; 585&nbsp;&nbsp;&nbsp;&nbsp; msg =3D =
(rmc_msg_t *)rmc_alloc_msg(bufsz);</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; 586&nbsp;&nbsp;&nbsp;&nbsp; if (msg =
=3D=3D NULL) {</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; =
587&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
ASSERT(0);</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; =
588&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return =
RMC_NOMEM;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; 589&nbsp;&nbsp;&nbsp;&nbsp; =
}</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; 590</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp; 591&nbsp;&nbsp;&nbsp;&nbsp; =
memcpy(msg-&gt;sg_list[0].buf, buf, bufsz);</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">It would =
appear that perhaps rmc_alloc_msg() is not allocating =
enough.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">However, =
my review of rmc_alloc_msg(), with help from Rendell, did not identify =
any problem.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2054 API rmc_msg_t *</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2055 rmc_alloc_msg(int32 =
sz)</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2056 {</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2057&nbsp;&nbsp;&nbsp;&nbsp; rmc_msg_t =
*msg;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2058 </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2059&nbsp;&nbsp;&nbsp;&nbsp; if (!(msg =3D =
(rmc_msg_t *)calloc(sizeof(rmc_msg_t) + sz, 1))) {</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2060&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //return =
NULL;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2061&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // May be leaking =
memory.&nbsp; Abort and let pm restart the daemons.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2062&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
abort();</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2063&nbsp;&nbsp;&nbsp;&nbsp; =
}</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2064 </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2065&nbsp;&nbsp;&nbsp;&nbsp; if (sz) =
{</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2066&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; msg-&gt;sg_cnt =3D =
1;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2067&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
msg-&gt;sg_list[0].buf =3D ((char *)msg + sizeof(rmc_msg_t));&nbsp; =
&lt;=3D=3D=3D=3D=3D=3D=3D I think this setting is okay, though =
unconventional</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2068&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
msg-&gt;sg_list[0].len =3D sz;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2069&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
msg-&gt;ihdr.msg_len =3D sz;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2070 </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2071&nbsp;&nbsp;&nbsp;&nbsp; } else =
{</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2072&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; msg-&gt;sg_cnt =3D =
0;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; =
2073&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
msg-&gt;ihdr.msg_len =3D 0;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2074&nbsp;&nbsp;&nbsp;&nbsp; =
}</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2075 </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2076&nbsp;&nbsp;&nbsp;&nbsp; /* JTOF - we =
set the type here (negative for RMC) so apps know</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2077&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; * if they =
did the alloc or the RMC layer did. It's not checked</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2078&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; * by the =
free routine because we alloc mallocs - if/when a </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2079&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; * =
pre-allocated list is added, this flag will be used to =
</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2080&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; * mark =
these messages</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2081&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
*/</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2082&nbsp;&nbsp;&nbsp;&nbsp; msg-&gt;memtyp =
=3D -1;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2083&nbsp;&nbsp;&nbsp;&nbsp; return =
msg;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp; 2084 }</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Though =
the single call to calloc() is a little unusual, I don't see a problem =
with this efficient logic.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">So, my =
question is: could dmalloc report false-positives?</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Also, =
should I break this calloc call into two calls (one for msg and the =
other for buf), for sake of clarity?</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Thanks.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">-Mike</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

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