From db80fe3866c60dc263b50c4c3724c72e91d6fe04 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Thu, 16 May 2019 23:31:29 +0200 Subject: [PATCH] efi_loader: parameter checks CalculateCrc32() Not checking the parameters may lead reading or writing from NULL. Implement the parameter checks prescribed in the UEFI spec. Signed-off-by: Heinrich Schuchardt --- lib/efi_loader/efi_boottime.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index d3f21f15b7..ce6ca06f75 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -2465,9 +2465,16 @@ static efi_status_t EFIAPI efi_calculate_crc32(const void *data, efi_uintn_t data_size, u32 *crc32_p) { + efi_status_t ret = EFI_SUCCESS; + EFI_ENTRY("%p, %zu", data, data_size); + if (!data || !data_size || !crc32_p) { + ret = EFI_INVALID_PARAMETER; + goto out; + } *crc32_p = crc32(0, data, data_size); - return EFI_EXIT(EFI_SUCCESS); +out: + return EFI_EXIT(ret); } /** -- 2.39.5