[tip: efi/urgent] efi: Add a sanity check to efivar_store_raw()

[tip-bot2 for Vladis Dronov]

The following commit has been merged into the efi/urgent branch of tip:

Commit-ID:     d6c066fda90d578aacdf19771a027ed484a79825
Gitweb:        https://git.kernel.org/tip/d6c066fda90d578aacdf19771a027ed484a79825
Author:        Vladis Dronov <vdronov@xxxxxxxxxx>
AuthorDate:    Sun, 08 Mar 2020 09:08:55 +01:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Sun, 08 Mar 2020 09:56:48 +01:00

efi: Add a sanity check to efivar_store_raw()

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
---
 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 69f13bc..aff3dfb 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;