Date: Sat, 17 Oct 2020 08:03:39 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 144325] [libpcap] tcpdump compiles complex expression to incorrect BPF code Message-ID: <bug-144325-227-86FiGBoFB2@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-144325-227@https.bugs.freebsd.org/bugzilla/> References: <bug-144325-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=144325 --- Comment #5 from Archit Shah <archit.shah@gmail.com> --- Created attachment 218833 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218833&action=edit Proposed patch The bug appears to be in libpcap. The libpcap optimizer (contrib/libpcap/optimizer.c) removes statements as dead that store certain values but does not account for the fact that a successor block may attempt to read the value written by the dead statemenent. The proposed patch marks the "val" data structure as having unknown value when statements are removed as dead to indicate to successor blocks that the value is not available. (I will also report this upstream.) -- You are receiving this mail because: You are the assignee for the bug.help
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