CVE-2020-28013: Heap buffer overflow in parse_fix_phrase()

[exim.git] / src / src / queue.c

diff --git a/src/src/queue.c b/src/src/queue.c
index bb75c99cd13c393006327958057d01b162ce91ab..a93a7a55fcd1daf229eed345524a666b322aead7 100644 (file)
--- a/src/src/queue.c
+++ b/src/src/queue.c
@@ -3,6 +3,7 @@
 *************************************************/
 
 /* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* Functions that operate on the input queue. */
@@ -125,8 +126,6 @@ int resetflags = -1;
 int subptr;
 queue_filename *yield = NULL;
 queue_filename *last = NULL;
-struct dirent *ent;
-DIR *dd;
 uschar buffer[256];
 queue_filename *root[LOG2_MAXNODES];
 
@@ -171,6 +170,7 @@ for (; i <= *subcount; i++)
   {
   int count = 0;
   int subdirchar = subdirs[i];      /* 0 for main directory */
+  DIR *dd;
 
   if (subdirchar != 0)
     {
@@ -179,12 +179,12 @@ for (; i <= *subcount; i++)
     }
 
   DEBUG(D_queue_run) debug_printf("looking in %s\n", buffer);
-  if (!(dd = opendir(CS buffer)))
+  if (!(dd = exim_opendir(buffer)))
     continue;
 
   /* Now scan the directory. */
 
-  while ((ent = readdir(dd)))
+  for (struct dirent *ent; ent = readdir(dd); )
     {
     uschar *name = US ent->d_name;
     int len = Ustrlen(name);
@@ -393,12 +393,18 @@ if (!recurse)
     p += sprintf(CS p, " -q%s", extras);
 
   if (deliver_selectstring)
-    p += sprintf(CS p, " -R%s %s", f.deliver_selectstring_regex? "r" : "",
-      deliver_selectstring);
+    {
+    snprintf(CS p, big_buffer_size - (p - big_buffer), " -R%s %s",
+      f.deliver_selectstring_regex? "r" : "", deliver_selectstring);
+    p += Ustrlen(CCS p);
+    }
 
   if (deliver_selectstring_sender)
-    p += sprintf(CS p, " -S%s %s", f.deliver_selectstring_sender_regex? "r" : "",
-      deliver_selectstring_sender);
+    {
+    snprintf(CS p, big_buffer_size - (p - big_buffer), " -S%s %s",
+      f.deliver_selectstring_sender_regex? "r" : "", deliver_selectstring_sender);
+    p += Ustrlen(CCS p);
+    }
 
   log_detail = string_copy(big_buffer);
   if (*queue_name)