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Resolver: fixed possible use-after-free while resolving SRV. Resolving an SRV record includes resolving its host names in subrequests. Previously, if memory allocation failed while reporting a subrequest result after receiving a response from a DNS server, the SRV resolve handler was called immediately with the NGX_ERROR state. However, if the SRV record included another copy of the resolved name, it was reported once again. This could trigger the use-after-free memory access after SRV resolve handler freed the resolve context by calling ngx_resolve_name_done(). Now the SRV resolve handler is called only when all its subrequests are completed.
author Roman Arutyunyan <arut@nginx.com>
date Tue, 04 Jul 2017 18:07:29 +0300
parents b7b7f3a0cc28
children f3ff79ae31d9
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


have=NGX_WIN32 . auto/have_headers

CORE_INCS="$WIN32_INCS"
CORE_DEPS="$WIN32_DEPS"
CORE_SRCS="$WIN32_SRCS $IOCP_SRCS"
OS_CONFIG="$WIN32_CONFIG"
NGX_ICONS="$NGX_WIN32_ICONS"
SELECT_SRCS=$WIN32_SELECT_SRCS

ngx_pic_opt=
ngx_binext=".exe"

case "$NGX_CC_NAME" in

    gcc)
        CORE_LIBS="$CORE_LIBS -ladvapi32 -lws2_32"
        MAIN_LINK="$MAIN_LINK -Wl,--export-all-symbols"
        MAIN_LINK="$MAIN_LINK -Wl,--out-implib=$NGX_OBJS/libnginx.a"
        MODULE_LINK="-shared -L $NGX_OBJS -lnginx"
    ;;

    *)
        CORE_LIBS="$CORE_LIBS advapi32.lib ws2_32.lib"
    ;;

esac

EVENT_MODULES="$EVENT_MODULES $IOCP_MODULE"
EVENT_FOUND=YES

if [ $EVENT_SELECT = NO ]; then
    CORE_SRCS="$CORE_SRCS $SELECT_SRCS"
    EVENT_MODULES="$EVENT_MODULES $SELECT_MODULE"
fi

have=NGX_HAVE_INET6 . auto/have

have=NGX_HAVE_IOCP . auto/have