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annotate src/event/ngx_event_udp.h @ 8106:8852f39311de

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Fixed segfault when switching off master process during upgrade. Binary upgrades are not supported without master process, but it is, however, possible, that nginx running with master process is asked to upgrade binary, and the configuration file as available on disk at this time includes "master_process off;". If this happens, listening sockets inherited from the previous binary will have ls[i].previous set. But the old cycle on initial process startup, including startup after binary upgrade, is destroyed by ngx_init_cycle() once configuration parsing is complete. As a result, an attempt to dereference ls[i].previous in ngx_event_process_init() accesses already freed memory. Fix is to avoid looking into ls[i].previous if the old cycle is already freed. With this change it is also no longer needed to clear ls[i].previous in worker processes, so the relevant code was removed.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 23 Nov 2022 23:48:53 +0300
parents 0f6cc8f73744
children ce6d9cf0f567
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1
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2 /*
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3 * Copyright (C) Nginx, Inc.
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4 */
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7 #ifndef _NGX_EVENT_UDP_H_INCLUDED_
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8 #define _NGX_EVENT_UDP_H_INCLUDED_
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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15 #if !(NGX_WIN32)
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17 #if ((NGX_HAVE_MSGHDR_MSG_CONTROL) \
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18 && (NGX_HAVE_IP_SENDSRCADDR || NGX_HAVE_IP_RECVDSTADDR \
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19 || NGX_HAVE_IP_PKTINFO \
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20 || (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO)))
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21 #define NGX_HAVE_ADDRINFO_CMSG 1
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23 #endif
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26 #if (NGX_HAVE_ADDRINFO_CMSG)
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27
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28 typedef union {
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29 #if (NGX_HAVE_IP_SENDSRCADDR || NGX_HAVE_IP_RECVDSTADDR)
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30 struct in_addr addr;
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31 #endif
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33 #if (NGX_HAVE_IP_PKTINFO)
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34 struct in_pktinfo pkt;
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35 #endif
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37 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO)
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38 struct in6_pktinfo pkt6;
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39 #endif
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40 } ngx_addrinfo_t;
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42 size_t ngx_set_srcaddr_cmsg(struct cmsghdr *cmsg,
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43 struct sockaddr *local_sockaddr);
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44 ngx_int_t ngx_get_srcaddr_cmsg(struct cmsghdr *cmsg,
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45 struct sockaddr *local_sockaddr);
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47 #endif
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49 void ngx_event_recvmsg(ngx_event_t *ev);
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50 ssize_t ngx_sendmsg(ngx_connection_t *c, struct msghdr *msg, int flags);
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51 void ngx_udp_rbtree_insert_value(ngx_rbtree_node_t *temp,
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52 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
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53 #endif
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55 void ngx_delete_udp_connection(void *data);
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58 #endif /* _NGX_EVENT_UDP_H_INCLUDED_ */