efi: Fix several memory leaks of UEFI handles

Fix possible and absolute memory leaks of "handles"
returned by grub_efi_locate_handle() using grub_malloc().

Signed-off-by: Khalid Ali <khaliidcaliy@gmail.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

Author: khaliid2040

grub-core/commands/efi/lsefi.c

@@ -129,6 +129,7 @@ grub_cmd_lsefi (grub_command_t cmd __attribute__ ((unused)),
 
     }
 
+  grub_free (handles);
   return 0;
 }
 

grub-core/commands/efi/tpm.c

@@ -113,6 +113,7 @@ grub_tpm_handle_find (grub_efi_handle_t *tpm_handle,
       grub_tpm_version = 1;
       *protocol_version = 1;
       grub_dprintf ("tpm", "TPM handle Found, version: 1\n");
+      grub_free (handles);
       return 1;
     }
 
@@ -125,6 +126,7 @@ grub_tpm_handle_find (grub_efi_handle_t *tpm_handle,
       grub_tpm_version = 2;
       *protocol_version = 2;
       grub_dprintf ("tpm", "TPM handle Found, version: 2\n");
+      grub_free (handles);
       return 1;
     }
 

grub-core/term/efi/serial.c

@@ -169,13 +169,13 @@ grub_efiserial_init (void)
 
       port = grub_zalloc (sizeof (*port));
       if (!port)
-	return;
+	break;
 
       port->name = grub_malloc (sizeof ("efiXXXXXXXXXXXXXXXXXXXX"));
       if (!port->name)
 	{
 	  grub_free (port);
-	  return;
+	  break;
 	}
       grub_snprintf (port->name, sizeof ("efiXXXXXXXXXXXXXXXXXXXX"),
 		     "efi%d", num_serial++);

grub-core/video/efi_gop.c

@@ -94,7 +94,7 @@ check_protocol (void)
   gop_handle = 0;
 
   grub_dprintf ("video", "GOP: no usable mode\n");
-
+  grub_free (handles);
   return 0;
 }