File CVE-2015-7519.patch of Package rubygem-passenger.3847

diff --git a/ext/common/agent/Core/RequestHandler/SendRequest.cpp b/ext/common/agent/Core/RequestHandler/SendRequest.cpp
index 367ca34..190b6bf 100644
--- a/ext/common/agent/Core/RequestHandler/SendRequest.cpp
+++ b/ext/common/agent/Core/RequestHandler/SendRequest.cpp
@@ -138,6 +138,26 @@ sendHeaderToAppWithSessionProtocol(Client *client, Request *req) {
 	(void) ok; // Shut up compiler warning
 }
 
+/**
+ * For CGI, alphanum headers with optional dashes are mapped to UPP3R_CAS3. This function can be used to reject
+ * non-alphanum/dash headers that would end up with the same mapping (e.g. upp3r_cas3 and upp3r-cas3 would end up
+ * the same, and potentially collide each other in the receiving application).
+ */
+static bool
+containsNonAlphaNumDash(const LString &s) {
+   const LString::Part *part = s.start;
+   while (part != NULL) {
+       for (unsigned int i = 0; i < part->size; i++) {
+           const char start = part->data[i];
+           if (start != '-' && !std::isalnum(start)) {
+               return true;
+           }
+       }
+       part = part->next;
+   }
+   return false;
+}
+
 static void
 sendBodyToAppWhenAppSinkIdle(Channel *_channel, unsigned int size) {
 	FdSinkChannel *channel = reinterpret_cast<FdSinkChannel *>(_channel);
@@ -426,12 +446,18 @@ constructHeaderForSessionProtocol(Request *req, char * restrict buffer, unsigned
 
 	ServerKit::HeaderTable::Iterator it(req->headers);
 	while (*it != NULL) {
-		if ((it->header->hash == HTTP_CONTENT_LENGTH.hash()
-			|| it->header->hash == HTTP_CONTENT_TYPE.hash()
-			|| it->header->hash == HTTP_CONNECTION.hash())
-		 && (psg_lstr_cmp(&it->header->key, P_STATIC_STRING("content-type"))
-			|| psg_lstr_cmp(&it->header->key, P_STATIC_STRING("content-length"))
-			|| psg_lstr_cmp(&it->header->key, P_STATIC_STRING("connection"))))
+    // This header-skipping is not accounted for in determineHeaderSizeForSessionProtocol(), but
+    // since we are only reducing the size it just wastes some mem bytes.
+		if ((
+          (it->header->hash == HTTP_CONTENT_LENGTH.hash()
+           || it->header->hash == HTTP_CONTENT_TYPE.hash()
+           || it->header->hash == HTTP_CONNECTION.hash())
+          && (psg_lstr_cmp(&it->header->key, P_STATIC_STRING("content-type"))
+            || psg_lstr_cmp(&it->header->key, P_STATIC_STRING("content-length"))
+            || psg_lstr_cmp(&it->header->key, P_STATIC_STRING("connection"))
+            )
+          ) || containsNonAlphaNumDash(it->header->key)
+       )
 		{
 			it.next();
 			continue;