Hi Richard,
If list of available buffers (*db->lookaside.pFree*) is NULL and
it is assigned
to pBuf and if you access pBuf->pNext it will crash. read my comments in
below code
snippet.
There is good chance that sqlite may end up with empty
lookaside pool(*db->lookaside.pFree*) list when there were many prepare
statements are executed.
please read my comments in code:
if( db->lookaside.bEnabled ){
if( n>db->lookaside.sz ){
db->lookaside.anStat[1]++;
}
* //pBuf assigned with list of available buffers *
* else if( (pBuf = db->lookaside.pFree)==0 ){*
db->lookaside.anStat[2]++;
}else{
* //it will crash here and there is no check for NULL here*
* db->lookaside.pFree = pBuf->pNext;*
db->lookaside.nOut++;
db->lookaside.anStat[0]++;
if( db->lookaside.nOut>db->lookaside.mxOut ){
db->lookaside.mxOut = db->lookaside.nOut;
}
return (void*)pBuf;
Regards,
Ashok
On Tue, Aug 20, 2013 at 7:10 PM, Richard Hipp <[email protected]> wrote:
> On Tue, Aug 20, 2013 at 9:38 AM, Ashok Pitambar <[email protected]
> >wrote:
>
> > Hi All,
> >
> > I am facing an issue where in sqlite3DbMallocRaw function
> > crashes while trying to access pBuf->pNext. Did anybody came across this
> > issue? any help is appreciated.
> >
>
> This is generally an indication of heap corruption. Have you run your
> application using valgrind?
>
>
> --
> D. Richard Hipp
> [email protected]
> _______________________________________________
> sqlite-users mailing list
> [email protected]
> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
>
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