Date: Tue, 15 Oct 2019 09:50:02 +0000 (UTC) From: "Andrey V. Elsukov" <ae@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r353545 - head/sbin/ipfw Message-ID: <201910150950.x9F9o2Yg039456@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: ae Date: Tue Oct 15 09:50:02 2019 New Revision: 353545 URL: https://svnweb.freebsd.org/changeset/base/353545 Log: Explicitly initialize the memory buffer to store O_ICMP6TYPE opcode. By default next_cmd() initializes only first u32 of opcode. O_ICMP6TYPE opcode has array of bit masks to store corresponding ICMPv6 types. An opcode that precedes O_ICMP6TYPE, e.g. O_IP6_DST, can have variable length and during opcode filling it can modify memory that will be used by O_ICMP6TYPE opcode. Without explicit initialization this leads to creation of wrong opcode. Reported by: Boris N. Lytochkin Obtained from: Yandex LLC MFC after: 3 days Modified: head/sbin/ipfw/ipv6.c Modified: head/sbin/ipfw/ipv6.c ============================================================================== --- head/sbin/ipfw/ipv6.c Tue Oct 15 08:33:05 2019 (r353544) +++ head/sbin/ipfw/ipv6.c Tue Oct 15 09:50:02 2019 (r353545) @@ -143,6 +143,7 @@ fill_icmp6types(ipfw_insn_icmp6 *cmd, char *av, int cb uint8_t type; CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn_icmp6)); + memset(cmd, 0, sizeof(*cmd)); while (*av) { if (*av == ',') av++;
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201910150950.x9F9o2Yg039456>