[binutils-gdb] Fix nullptr in with_command_1

[Pedro Alves <palves at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=26c957f12762816a90d5145c7c527ca48c890855

commit 26c957f12762816a90d5145c7c527ca48c890855
Author: Pedro Alves <palves@redhat.com>
Date:   Wed Aug 21 21:11:33 2019 +0100

    Fix nullptr in with_command_1
    
    Running 'with' without arguments crashes GDB.  This fixes it.
    
    gdb/ChangeLog:
    2019-08-21  Bogdan Harjoc  <harjoc@gmail.com>
    
    	* cli/cli-cmds.c (with_command_1): Error out if no arguments.
    
    gdb/testsuite/ChangeLog:
    2019-08-21  Pedro Alves  <palves@redhat.com>
    
    	* gdb.base/with.exp: Test "with" with no arguments.

Diff:
---
 gdb/ChangeLog                   | 4 ++++
 gdb/cli/cli-cmds.c              | 3 +++
 gdb/testsuite/ChangeLog         | 4 ++++
 gdb/testsuite/gdb.base/with.exp | 2 ++
 4 files changed, 13 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 01e60fb..966bfb7 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2019-08-21  Bogdan Harjoc  <harjoc@gmail.com>
+
+	* cli/cli-cmds.c (with_command_1): Error out if no arguments.
+
 2019-08-21  Christian Biesinger  <cbiesinger@google.com>
 
 	* tui/tui-data.h (tui_gen_win_info): Add an =default
diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index 30e0958..4fc6567 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -217,6 +217,9 @@ void
 with_command_1 (const char *set_cmd_prefix,
 		cmd_list_element *setlist, const char *args, int from_tty)
 {
+  if (args == nullptr)
+    error (_("Missing arguments."));
+
   const char *delim = strstr (args, "--");
   const char *nested_cmd = nullptr;
 
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 7fea9cd..e56cc16 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2019-08-21  Pedro Alves  <palves@redhat.com>
+
+	* gdb.base/with.exp: Test "with" with no arguments.
+
 2019-08-21  Tom de Vries  <tdevries@suse.de>
 
 	* gdb.base/gdb-caching-proc.exp: Sort files.
diff --git a/gdb/testsuite/gdb.base/with.exp b/gdb/testsuite/gdb.base/with.exp
index 9ea7685..a972296 100644
--- a/gdb/testsuite/gdb.base/with.exp
+++ b/gdb/testsuite/gdb.base/with.exp
@@ -220,6 +220,8 @@ with_test_prefix "run control" {
 
 # Check errors.
 with_test_prefix "errors" {
+    gdb_test "with" "Missing arguments\\."
+
     # Try both an unknown root setting and an unknown prefixed
     # setting.  The errors come from different locations in the
     # sources.