grub2/0188-blscfg-add-a-space-char-when-appending-fields-for-va.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Tue, 26 Nov 2019 09:51:41 +0100
Subject: [PATCH] blscfg: add a space char when appending fields for variable
 expansion

The GRUB variables are expanded and replaced by their values before adding
menu entries, but they didn't include space characters after the values so
the result was not correct.

For the common case this wasn't a problem but it is if there are variables
that are part of the values of other variables.

Resolves: rhbz#1669252

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
 grub-core/commands/blscfg.c | 31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
index 471975fd2e5..d78cff79f97 100644
--- a/grub-core/commands/blscfg.c
+++ b/grub-core/commands/blscfg.c
@@ -593,26 +593,29 @@ static char **bls_make_list (struct bls_entry *entry, const char *key, int *num)
 
 static char *field_append(bool is_var, char *buffer, char *start, char *end)
 {
-  char *temp = grub_strndup(start, end - start + 1);
-  const char *field = temp;
+  char *tmp = grub_strndup(start, end - start + 1);
+  const char *field = tmp;
+  int term = is_var ? 2 : 1;
 
   if (is_var) {
-    field = grub_env_get (temp);
+    field = grub_env_get (tmp);
     if (!field)
       return buffer;
   }
 
-  if (!buffer) {
-    buffer = grub_strdup(field);
-    if (!buffer)
-      return NULL;
-  } else {
-    buffer = grub_realloc (buffer, grub_strlen(buffer) + grub_strlen(field));
-    if (!buffer)
-      return NULL;
+  if (!buffer)
+    buffer = grub_zalloc (grub_strlen(field) + term);
+  else
+    buffer = grub_realloc (buffer, grub_strlen(buffer) + grub_strlen(field) + term);
 
-    grub_stpcpy (buffer + grub_strlen(buffer), field);
-  }
+  if (!buffer)
+    return NULL;
+
+  tmp = buffer + grub_strlen(buffer);
+  tmp = grub_stpcpy (tmp, field);
+
+  if (is_var)
+      tmp = grub_stpcpy (tmp, " ");
 
   return buffer;
 }
@@ -642,6 +645,8 @@ static char *expand_val(char *value)
 	buffer = field_append(is_var, buffer, start, end);
 	is_var = false;
 	start = value;
+	if (*start == ' ')
+	  start++;
       }
     }