res_pjsip: Remove spurious error logging when printing silent headers

Asterisk patched the pjproject source to avoid crashing when pjproject
sip_msg headers are encountered with NULL vptr's, but the patch also
output error messages for some valid headers which simply did not need
to be added to the message itself, such as hidden route headers.

pjproject has since applied a similar patch to their baseline to avoid
crashes, but their version also avoids the spurious error logging.

Lets use their patch instead.

ASTERISK-27961 #close

Change-Id: I2ddbd82c8da10e0dcc9807a48089d1f3c2d6e389

third-party/pjproject/patches/0060-sip_msg-Prevent-crash-on-header-without-vptr.patch

@@ -1,18 +1,22 @@
-From cf6b662b8fe450ea7dc6eb5adb2b878971ce0d67 Mon Sep 17 00:00:00 2001
-From: George Joseph <gjoseph@digium.com>
-Date: Wed, 10 Jan 2018 08:48:32 -0700
-Subject: [PATCH] sip_msg: Prevent crash on header without vptr
+From 88409082a4cbf27b308c76c148270ee72fdcb503 Mon Sep 17 00:00:00 2001
+From: Riza Sulistyo <riza@teluu.com>
+Date: Wed, 17 Jan 2018 11:30:52 +0000
+Subject: [PATCH] r5727 svn backport sip_msg: Prevent crash on header without
+ vptr
+
+Re #2059 (misc): Prevent corrupt header from causing a crash when printed.
+Thanks to George Joseph for the patch.
 
 Occasionally a header with no vptr gets into the list of header.  This
 causes a crash when printing them.  We still need to figure out how
 the header got there but this patch at least prevents the crash by checking
 for a non-NULL vptr before attempting to call its print function.
 ---
- pjsip/src/pjsip/sip_msg.c | 6 ++++++
- 1 file changed, 6 insertions(+)
+ pjsip/src/pjsip/sip_msg.c | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
 
 diff --git a/pjsip/src/pjsip/sip_msg.c b/pjsip/src/pjsip/sip_msg.c
-index 76d07b563..194b5ee01 100644
+index a13f80e..8819dd9 100644
 --- a/pjsip/src/pjsip/sip_msg.c
 +++ b/pjsip/src/pjsip/sip_msg.c
 @@ -26,6 +26,7 @@
@@ -23,25 +27,30 @@ index 76d07b563..194b5ee01 100644
  #include <pjlib-util/string.h>
  
  PJ_DEF_DATA(const pjsip_method) pjsip_invite_method =
-@@ -469,6 +470,8 @@ PJ_DEF(pj_ssize_t) pjsip_msg_print( const pjsip_msg *msg,
- 
- 	    *p++ = '\r';
- 	    *p++ = '\n';
-+	} else {
-+	    PJ_LOG(1, ("sip_msg", "Header with no vptr encountered!!  Current buffer: %.*s", (int)(p-buf), buf));
- 	}
-     }
+@@ -461,8 +462,13 @@ PJ_DEF(pj_ssize_t) pjsip_msg_print( const pjsip_msg *msg,
+     /* Print each of the headers. */
+     for (hdr=msg->hdr.next; hdr!=&msg->hdr; hdr=hdr->next) {
+ 	len = pjsip_hdr_print_on(hdr, p, end-p);
+-	if (len < 0)
+-	    return -1;
++	if (len < 0) {
++	   if (len == -2) {
++	       PJ_LOG(5, ("sip_msg", "Header with no vptr encountered!! "\
++			  "Current buffer: %.*s", (int)(p-buf), buf));
++	   }
++	   return len;
++	}
  
-@@ -576,6 +579,9 @@ PJ_DEF(void*) pjsip_hdr_shallow_clone( pj_pool_t *pool, const void *hdr_ptr )
+ 	if (len > 0) {
+ 	    p += len;
+@@ -578,6 +584,7 @@ PJ_DEF(void*) pjsip_hdr_shallow_clone( pj_pool_t *pool, const void *hdr_ptr )
  PJ_DEF(int) pjsip_hdr_print_on( void *hdr_ptr, char *buf, pj_size_t len)
  {
      pjsip_hdr *hdr = (pjsip_hdr*) hdr_ptr;
-+    if (!hdr->vptr) {
-+        return 0;
-+    }
++    PJ_ASSERT_RETURN(hdr->vptr, -2);
      return (*hdr->vptr->print_on)(hdr_ptr, buf, len);
  }
  
 -- 
-2.14.3
+2.7.4