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changeset 8110:06c7d84cafdb

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SSL: fixed ngx_ssl_recv() to reset c->read->ready after errors. With this change, behaviour of ngx_ssl_recv() now matches ngx_unix_recv(), which used to always reset c->read->ready to 0 when returning errors. This fixes an infinite loop in unbuffered SSL proxying if writing to the client is blocked and an SSL error happens (ticket #2418). With this change, the fix for a similar issue in the stream module (6868:ee3645078759), which used a different approach of explicitly testing c->read->error instead, is no longer needed and was reverted.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 01 Dec 2022 04:22:31 +0300
parents 2ffefe2f892e
children 56819a9491fe
files src/event/ngx_event_openssl.c src/stream/ngx_stream_proxy_module.c
diffstat 2 files changed, 7 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -2204,6 +2204,7 @@ ngx_ssl_recv(ngx_connection_t *c, u_char
 #endif
 
     if (c->ssl->last == NGX_ERROR) {
+        c->read->ready = 0;
         c->read->error = 1;
         return NGX_ERROR;
     }
@@ -2270,6 +2271,7 @@ ngx_ssl_recv(ngx_connection_t *c, u_char
 #if (NGX_HAVE_FIONREAD)
 
                     if (ngx_socket_nread(c->fd, &c->read->available) == -1) {
+                        c->read->ready = 0;
                         c->read->error = 1;
                         ngx_connection_error(c, ngx_socket_errno,
                                              ngx_socket_nread_n " failed");
@@ -2306,6 +2308,7 @@ ngx_ssl_recv(ngx_connection_t *c, u_char
             return 0;
 
         case NGX_ERROR:
+            c->read->ready = 0;
             c->read->error = 1;
 
             /* fall through */
@@ -2326,6 +2329,7 @@ ngx_ssl_recv_early(ngx_connection_t *c, 
     size_t     readbytes;
 
     if (c->ssl->last == NGX_ERROR) {
+        c->read->ready = 0;
         c->read->error = 1;
         return NGX_ERROR;
     }
@@ -2425,6 +2429,7 @@ ngx_ssl_recv_early(ngx_connection_t *c, 
             return 0;
 
         case NGX_ERROR:
+            c->read->ready = 0;
             c->read->error = 1;
 
             /* fall through */
--- a/src/stream/ngx_stream_proxy_module.c
+++ b/src/stream/ngx_stream_proxy_module.c
@@ -1675,9 +1675,8 @@ ngx_stream_proxy_process(ngx_stream_sess
 
         size = b->end - b->last;
 
-        if (size && src->read->ready && !src->read->delayed
-            && !src->read->error)
-        {
+        if (size && src->read->ready && !src->read->delayed) {
+
             if (limit_rate) {
                 limit = (off_t) limit_rate * (ngx_time() - u->start_sec + 1)
                         - *received;