Mercurial > hg > nginx-quic
annotate src/event/ngx_event_posted.c @ 4964:2464ccebdb52
Upstream: fixed SIGSEGV with the "if" directive.
Configuration like
location / {
set $true 1;
if ($true) {
proxy_pass http://backend;
}
if ($true) {
# nothing
}
}
resulted in segmentation fault due to NULL pointer dereference as the
upstream configuration wasn't initialized in an implicit location created
by the last if(), but the r->content_handler was set due to first if().
Instead of committing a suicide by dereferencing a NULL pointer, return
500 (Internal Server Error) in such cases, i.e. if uscf is NULL. Better
fix would be to avoid such cases by fixing the "if" directive handling,
but it's out of scope of this patch.
Prodded by Piotr Sikora.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Thu, 13 Dec 2012 16:05:59 +0000 |
parents | d620f497c50f |
children | 3377f9459e99 |
rev | line source |
---|---|
441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_event.h> |
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11 |
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12 |
563 | 13 ngx_thread_volatile ngx_event_t *ngx_posted_accept_events; |
306
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14 ngx_thread_volatile ngx_event_t *ngx_posted_events; |
370
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15 |
306
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16 #if (NGX_THREADS) |
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17 ngx_mutex_t *ngx_posted_events_mutex; |
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18 #endif |
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19 |
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20 |
563 | 21 void |
22 ngx_event_process_posted(ngx_cycle_t *cycle, | |
23 ngx_thread_volatile ngx_event_t **posted) | |
306
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24 { |
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25 ngx_event_t *ev; |
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26 |
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27 for ( ;; ) { |
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28 |
563 | 29 ev = (ngx_event_t *) *posted; |
306
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30 |
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31 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
461 | 32 "posted event %p", ev); |
306
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33 |
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34 if (ev == NULL) { |
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35 return; |
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36 } |
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37 |
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38 ngx_delete_posted_event(ev); |
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39 |
509 | 40 ev->handler(ev); |
306
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41 } |
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42 } |
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43 |
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44 |
461 | 45 #if (NGX_THREADS) && !(NGX_WIN32) |
306
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46 |
563 | 47 void |
48 ngx_wakeup_worker_thread(ngx_cycle_t *cycle) | |
376
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49 { |
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50 ngx_int_t i; |
501 | 51 #if 0 |
377
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52 ngx_uint_t busy; |
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53 ngx_event_t *ev; |
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54 |
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55 busy = 1; |
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56 |
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57 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) { |
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58 return; |
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59 } |
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60 |
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61 for (ev = (ngx_event_t *) ngx_posted_events; ev; ev = ev->next) { |
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62 if (*(ev->lock) == 0) { |
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63 busy = 0; |
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64 break; |
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65 } |
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66 } |
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67 |
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68 ngx_mutex_unlock(ngx_posted_events_mutex); |
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69 |
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70 if (busy) { |
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71 return; |
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72 } |
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73 #endif |
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74 |
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75 for (i = 0; i < ngx_threads_n; i++) { |
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76 if (ngx_threads[i].state == NGX_THREAD_FREE) { |
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77 ngx_cond_signal(ngx_threads[i].cv); |
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78 return; |
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79 } |
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80 } |
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81 } |
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82 |
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83 |
563 | 84 ngx_int_t |
85 ngx_event_thread_process_posted(ngx_cycle_t *cycle) | |
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86 { |
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87 ngx_event_t *ev; |
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88 |
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89 for ( ;; ) { |
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90 |
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91 ev = (ngx_event_t *) ngx_posted_events; |
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92 |
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93 for ( ;; ) { |
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94 |
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95 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
461 | 96 "posted event %p", ev); |
370
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97 |
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98 if (ev == NULL) { |
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99 return NGX_OK; |
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100 } |
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101 |
371
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102 if (ngx_trylock(ev->lock) == 0) { |
370
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103 |
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104 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
461 | 105 "posted event %p is busy", ev); |
370
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106 |
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107 ev = ev->next; |
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108 continue; |
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109 } |
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110 |
380
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111 if (ev->lock != ev->own_lock) { |
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112 if (*(ev->own_lock)) { |
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113 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, |
461 | 114 "the own lock of the posted event %p is busy", ev); |
380
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115 ngx_unlock(ev->lock); |
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116 ev = ev->next; |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
117 continue; |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
118 } |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
119 *(ev->own_lock) = 1; |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
120 } |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
121 |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
122 ngx_delete_posted_event(ev); |
306
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
123 |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
124 ev->locked = 1; |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
125 |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
126 ev->ready |= ev->posted_ready; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
127 ev->timedout |= ev->posted_timedout; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
128 ev->pending_eof |= ev->posted_eof; |
469 | 129 #if (NGX_HAVE_KQUEUE) |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
130 ev->kq_errno |= ev->posted_errno; |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
131 #endif |
377
41437e4fd9b4
nginx-0.0.7-2004-07-05-19:08:23 import
Igor Sysoev <igor@sysoev.ru>
parents:
376
diff
changeset
|
132 if (ev->posted_available) { |
41437e4fd9b4
nginx-0.0.7-2004-07-05-19:08:23 import
Igor Sysoev <igor@sysoev.ru>
parents:
376
diff
changeset
|
133 ev->available = ev->posted_available; |
41437e4fd9b4
nginx-0.0.7-2004-07-05-19:08:23 import
Igor Sysoev <igor@sysoev.ru>
parents:
376
diff
changeset
|
134 } |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
135 |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
136 ev->posted_ready = 0; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
137 ev->posted_timedout = 0; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
138 ev->posted_eof = 0; |
469 | 139 #if (NGX_HAVE_KQUEUE) |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
140 ev->posted_errno = 0; |
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
374
diff
changeset
|
141 #endif |
377
41437e4fd9b4
nginx-0.0.7-2004-07-05-19:08:23 import
Igor Sysoev <igor@sysoev.ru>
parents:
376
diff
changeset
|
142 ev->posted_available = 0; |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
143 |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
144 ngx_mutex_unlock(ngx_posted_events_mutex); |
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
145 |
509 | 146 ev->handler(ev); |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
147 |
563 | 148 ngx_mutex_lock(ngx_posted_events_mutex); |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
149 |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
150 if (ev->locked) { |
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
151 ngx_unlock(ev->lock); |
380
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
152 |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
153 if (ev->lock != ev->own_lock) { |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
154 ngx_unlock(ev->own_lock); |
5ce6561246a5
nginx-0.0.7-2004-07-07-10:15:04 import
Igor Sysoev <igor@sysoev.ru>
parents:
379
diff
changeset
|
155 } |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
156 } |
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
373
diff
changeset
|
157 |
379
73688d5d7fc3
nginx-0.0.7-2004-07-06-20:12:16 import
Igor Sysoev <igor@sysoev.ru>
parents:
377
diff
changeset
|
158 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
461 | 159 "posted event %p is done", ev); |
379
73688d5d7fc3
nginx-0.0.7-2004-07-06-20:12:16 import
Igor Sysoev <igor@sysoev.ru>
parents:
377
diff
changeset
|
160 |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
161 break; |
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
Igor Sysoev <igor@sysoev.ru>
parents:
350
diff
changeset
|
162 } |
306
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
163 } |
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
164 } |
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
165 |
376
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
166 #else |
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
167 |
563 | 168 void |
169 ngx_wakeup_worker_thread(ngx_cycle_t *cycle) | |
376
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
170 { |
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
171 } |
d0451e402e27
nginx-0.0.7-2004-07-05-10:55:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
375
diff
changeset
|
172 |
306
6b91bfbc4123
nginx-0.0.3-2004-04-05-00:32:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
173 #endif |