[nginx] gRPC: clearing buffers in ngx_http_grpc_get_buf().

[Maxim Dounin]

details:   https://hg.nginx.org/nginx/rev/9ac0e8b9aced
branches:  stable-1.14
changeset: 7410:9ac0e8b9aced
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Mon Jul 02 19:02:08 2018 +0300
description:
gRPC: clearing buffers in ngx_http_grpc_get_buf().

We copy input buffers to our buffers, so various flags might be
unexpectedly set in buffers returned by ngx_chain_get_free_buf().

In particular, the b->in_file flag might be set when the body was
written to a file in a different context.  With sendfile enabled this
in turn might result in protocol corruption if such a buffer was reused
for a control frame.

Make sure to clear buffers and set only fields we really need to be set.

diffstat:

 src/http/modules/ngx_http_grpc_module.c |  29 +++++++++++++++++------------
 1 files changed, 17 insertions(+), 12 deletions(-)

diffs (57 lines):

diff --git a/src/http/modules/ngx_http_grpc_module.c b/src/http/modules/ngx_http_grpc_module.c
--- a/src/http/modules/ngx_http_grpc_module.c
+++ b/src/http/modules/ngx_http_grpc_module.c
@@ -3883,6 +3883,7 @@ ngx_http_grpc_send_window_update(ngx_htt
 static ngx_chain_t *
 ngx_http_grpc_get_buf(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx)
 {
+    u_char       *start;
     ngx_buf_t    *b;
     ngx_chain_t  *cl;
 
@@ -3892,29 +3893,33 @@ ngx_http_grpc_get_buf(ngx_http_request_t
     }
 
     b = cl->buf;
-
-    b->tag = (ngx_buf_tag_t) &ngx_http_grpc_body_output_filter;
-    b->temporary = 1;
-    b->flush = 1;
-
-    if (b->start == NULL) {
+    start = b->start;
+
+    if (start == NULL) {
 
         /*
          * each buffer is large enough to hold two window update
          * frames in a row
          */
 
-        b->start = ngx_palloc(r->pool, 2 * sizeof(ngx_http_grpc_frame_t) + 8);
-        if (b->start == NULL) {
+        start = ngx_palloc(r->pool, 2 * sizeof(ngx_http_grpc_frame_t) + 8);
+        if (start == NULL) {
             return NULL;
         }
 
-        b->pos = b->start;
-        b->last = b->start;
-
-        b->end = b->start + 2 * sizeof(ngx_http_grpc_frame_t) + 8;
     }
 
+    ngx_memzero(b, sizeof(ngx_buf_t));
+
+    b->start = start;
+    b->pos = start;
+    b->last = start;
+    b->end = start + 2 * sizeof(ngx_http_grpc_frame_t) + 8;
+
+    b->tag = (ngx_buf_tag_t) &ngx_http_grpc_body_output_filter;
+    b->temporary = 1;
+    b->flush = 1;
+
     return cl;
 }