[PATCH 5.4 088/123] efi: Add a sanity check to efivar_store_raw()

[Greg Kroah-Hartman]

From: Vladis Dronov <vdronov@xxxxxxxxxx>

commit d6c066fda90d578aacdf19771a027ed484a79825 upstream.

Add a sanity check to efivar_store_raw() the same way
efivar_{attr,size,data}_read() and efivar_show_raw() have it.

Signed-off-by: Vladis Dronov <vdronov@xxxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200305084041.24053-3-vdronov@xxxxxxxxxx
Link: https://lore.kernel.org/r/20200308080859.21568-25-ardb@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/firmware/efi/efivars.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -208,6 +208,9 @@ efivar_store_raw(struct efivar_entry *en
 	u8 *data;
 	int err;
 
+	if (!entry || !buf)
+		return -EINVAL;
+
 	if (in_compat_syscall()) {
 		struct compat_efi_variable *compat;