[PATCH 24/28] efi: add a sanity check to efivar_store_raw()

[Ard Biesheuvel]

From: Vladis Dronov <vdronov@xxxxxxxxxx>

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>
Link: https://lore.kernel.org/r/20200305084041.24053-3-vdronov@xxxxxxxxxx
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
---
 drivers/firmware/efi/efivars.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 485c592d7990..78ad1ba8c987 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -208,6 +208,9 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
 	u8 *data;
 	int err;
 
+	if (!entry || !buf)
+		return -EINVAL;
+
 	if (in_compat_syscall()) {
 		struct compat_efi_variable *compat;
 
-- 
2.17.1