diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 69e426e0e62..476712e6cba 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+2020-01-06  Shahab Vahedi  <shahab@synopsys.com>
+
+	* tui/tui-disasm.c (tui_disasm_window::addr_is_displayed): Avoid
+	overflow by an early check of content vs threshold.
+        * tui/tui-source.c (tui_source_window::line_is_displayed):
+	Likewise.
+
 2020-01-06  Eli Zaretskii  <eliz@gnu.org>
 
 	* NEWS: Mention the recent fix of $_exitsignal on MS-Windows.
diff --git a/gdb/tui/tui-disasm.c b/gdb/tui/tui-disasm.c
index ebd0ba317f5..98c691f3387 100644
--- a/gdb/tui/tui-disasm.c
+++ b/gdb/tui/tui-disasm.c
@@ -348,19 +348,17 @@ tui_disasm_window::location_matches_p (struct bp_location *loc, int line_no)
 bool
 tui_disasm_window::addr_is_displayed (CORE_ADDR addr) const
 {
-  bool is_displayed = false;
-  int threshold = SCROLL_THRESHOLD;
+  if (content.size () < SCROLL_THRESHOLD)
+    return false;
 
-  int i = 0;
-  while (i < content.size () - threshold && !is_displayed)
+  for (size_t i = 0; i < content.size () - SCROLL_THRESHOLD; ++i)
     {
-      is_displayed
-	= (content[i].line_or_addr.loa == LOA_ADDRESS
-	   && content[i].line_or_addr.u.addr == addr);
-      i++;
+      if (content[i].line_or_addr.loa == LOA_ADDRESS
+	  && content[i].line_or_addr.u.addr == addr)
+	return true;
     }
 
-  return is_displayed;
+  return false;
 }
 
 void
diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index e028b724d23..1503cd4c636 100644
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -174,18 +174,17 @@ tui_source_window::location_matches_p (struct bp_location *loc, int line_no)
 bool
 tui_source_window::line_is_displayed (int line) const
 {
-  bool is_displayed = false;
-  int threshold = SCROLL_THRESHOLD;
-  int i = 0;
-  while (i < content.size () - threshold && !is_displayed)
+  if (content.size () < SCROLL_THRESHOLD)
+    return false;
+
+  for (size_t i = 0; i < content.size () - SCROLL_THRESHOLD; ++i)
     {
-      is_displayed
-	= (content[i].line_or_addr.loa == LOA_LINE
-	   && content[i].line_or_addr.u.line_no == line);
-      i++;
+      if (content[i].line_or_addr.loa == LOA_LINE
+	  && content[i].line_or_addr.u.line_no == line)
+	return true;
     }
 
-  return is_displayed;
+  return false;
 }
 
 void