script/execute: Add missing grub_strdup() failure check

If grub_strdup() fails, it returns NULL and passing NULL further down to
the code can lead to segmentation fault or an undefined behavior.

Signed-off-by: Avnish Chouhan <avnish@linux.ibm.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index da99dfa050e8c30cfff7076f809018d2d5c70dfd..62afcdc99167c2ab9f1b888fdbcf59b27996f7ac 100644 (file)
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -1015,6 +1015,9 @@ grub_script_execute_cmdline (struct grub_script_cmd *cmd)
        {
          /* As a last resort, try if it is an assignment.  */
          char *assign = grub_strdup (cmdname);
+          if (assign == NULL)
+            return grub_errno;
+
          char *eq = grub_strchr (assign, '=');
 
          if (eq)