PDF-structtun_struct*tun=...;structsock*sk=−tun-sk;if(!tun)returnPO
Figure2AnullpointerdereferencevulnerabilityCVE20091897intheLinuxkernelwherethedereferenceofpointertunisbeforethenullpointercheckThecodebecomesexploitableasgccoptimizesawaythenullpointercheck10
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