Resolver: fixed crashes in timeout handler. If one or more requests were waiting for a response, then after getting a CNAME response, the timeout event on the first request remained active, pointing to the wrong node with an empty rn->waiting list, and that could cause either null pointer dereference or use-after-free memory access if this timeout expired. If several requests were waiting for a response, and the first request terminated (e.g., due to client closing a connection), other requests were left without a timeout and could potentially wait indefinitely. This is fixed by introducing per-request independent timeouts. This change also reverts 954867a2f0a6 and 5004210e8c78.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


CFLAGS = -q -O2 -tWM $(CPU_OPT) -DL_ENDIAN

!if "$(MD5_ASM)" == "YES"

md5.lib:
	cd $(MD5)
	bcc32 -c $(CFLAGS) -DMD5_ASM md5_dgst.c
	tlib md5.lib +md5_dgst.obj +"asm\m-win32.obj"

!else

md5.lib:
	cd $(MD5)
	bcc32 -c $(CFLAGS) md5_dgst.c
	tlib md5.lib +md5_dgst.obj

!endif