Check if get_next_variable() is actually valid pointer before calling it. In kdump kernel this method is set to NULL that causes panic during the kexec-ed kernel boot.
Tested with QEMU and OVMF firmware.
Fixes: bad267f9e18f ("efi: verify that variable services are supported") Cc: stable@vger.kernel.org Signed-off-by: Oleksandr Tymoshenko ovt@google.com --- Changes in v2: - Style fix - Added Cc: stable - Added Fixes: trailer --- drivers/firmware/efi/efi.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 8859fb0b006d..fdf07dd6f459 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -203,6 +203,8 @@ static bool generic_ops_supported(void)
name_size = sizeof(name);
+ if (!efi.get_next_variable) + return false; status = efi.get_next_variable(&name_size, &name, &guid); if (status == EFI_UNSUPPORTED) return false;