--- a/modules/proxy/mod_proxy_uwsgi.c	2020/07/24 09:31:46	1880250

+++ b/modules/proxy/mod_proxy_uwsgi.c	2020/07/24 09:35:25	1880251

@@ -136,7 +136,7 @@

     int j;

     apr_size_t headerlen = 4;

-    apr_uint16_t pktsize, keylen, vallen;

+    apr_size_t pktsize, keylen, vallen;

     const char *script_name;

     const char *path_info;

     const char *auth;

@@ -178,6 +178,15 @@

         headerlen += 2 + strlen(env[j].key) + 2 + strlen(env[j].val);

     }

+    pktsize = headerlen - 4;

+    if (pktsize > APR_UINT16_MAX) {

+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10259)

+                      "can't send headers to %s:%u: packet size too "

+                      "large (%" APR_SIZE_T_FMT ")",

+                      conn->hostname, conn->port, pktsize);

+        return HTTP_INTERNAL_SERVER_ERROR;

+    }

+

     ptr = buf = apr_palloc(r->pool, headerlen);

     ptr += 4;

@@ -196,8 +205,6 @@

         ptr += vallen;

     }

-    pktsize = headerlen - 4;

-

     buf[0] = 0;

     buf[1] = (apr_byte_t) (pktsize & 0xff);

     buf[2] = (apr_byte_t) ((pktsize >> 8) & 0xff);