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Request body: block write events while reading body.

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If write events are not blocked, an extra write event might happen for
various reasons (e.g. as a result of a http pipelining), resulting in
incorrect body being passed to a post handler.

The problem manifested itself with the dav module only, as this is
the only module which reads the body from a content phase handler (in
contrast to exclusive content handlers like proxy).  Additionally, dav
module used to dump core in such situations due to ticket #238.

See reports here:

http://mailman.nginx.org/pipermail/nginx-devel/2012-November/002981.html
http://serverfault.com/questions/449195/nginx-webdav-server-with-auth-request
This commit is contained in:
Maxim Dounin 2012-11-26 18:01:49 +00:00
parent aa955a2097
commit e769544a7d
1 changed files with 2 additions and 0 deletions
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2
src/http/ngx_http_request_body.c
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@ -105,6 +105,7 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
rb->buf = r->header_in; rb->buf = r->header_in;
r->read_event_handler = ngx_http_read_client_request_body_handler; r->read_event_handler = ngx_http_read_client_request_body_handler;
r->write_event_handler = ngx_http_request_empty_handler;
rc = ngx_http_do_read_client_request_body(r); rc = ngx_http_do_read_client_request_body(r);
goto done; goto done;
@ -166,6 +167,7 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
} }
r->read_event_handler = ngx_http_read_client_request_body_handler; r->read_event_handler = ngx_http_read_client_request_body_handler;
r->write_event_handler = ngx_http_request_empty_handler;
rc = ngx_http_do_read_client_request_body(r); rc = ngx_http_do_read_client_request_body(r);