[PATCH 1/1] gdb: Fix null pointer dereference on missing PATH variable

[Daniel Starke <daniel-email@gmx.net>]

When running "show" with missing PATH variable a null pointer is being
dereferenced in path_info().

path_command() correctly checks whether PATH has been set before using it.
It then calls path_info() which retrieves the variable again but fails to
perform the null pointer test on it. As a result, the application crashes with
SIGSEGV on Windows for example.

Fix this by handling the null pointer case in path_info() accordingly.

Signed-off-by: Daniel Starke <daniel-email@gmx.net>
---
 gdb/infcmd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index 00703e44b7b..adb2592ae8e 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -2116,7 +2116,10 @@ static void
 path_info (const char *args, int from_tty)
 {
   gdb_puts ("Executable and object file path: ");
-  gdb_puts (current_inferior ()->environment.get (path_var_name));
+  const char *env = current_inferior ()->environment.get (path_var_name);
+  if (!env)
+    env = "";
+  gdb_puts (env);
   gdb_puts ("\n");
 }

--
2.39.5