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EFI: Populate descriptor_count value only when image_info_size is not zero

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The GetImageInfo function of the Firmware Mangement Protocol(FMP) gets
called initially to query the size of the image descriptor array that
would have to be allocated. During this call, the rest of the function
arguments, specifically pointers might be passed as NULL. Do not
populate the descriptor_count value before it is known that the call
to GetImageInfo has been made with the allocated buffer for the image
descriptors.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Sughosh Ganu 2022-05-31 12:45:33 +05:30 committed by Heinrich Schuchardt
parent f1533c41a7
commit 6a463bc1c9
1 changed files with 2 additions and 3 deletions
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5
lib/efi_loader/efi_firmware.c
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@ -130,9 +130,6 @@ static efi_status_t efi_fill_image_desc_array(
struct efi_fw_image *fw_array;
int i;
fw_array = update_info.images;
*descriptor_count = num_image_type_guids;
total_size = sizeof(*image_info) * num_image_type_guids;
if (*image_info_size < total_size) {
@ -142,6 +139,8 @@ static efi_status_t efi_fill_image_desc_array(
}
*image_info_size = total_size;
fw_array = update_info.images;
*descriptor_count = num_image_type_guids;
*descriptor_version = EFI_FIRMWARE_IMAGE_DESCRIPTOR_VERSION;
*descriptor_size = sizeof(*image_info);
*package_version = 0xffffffff; /* not supported */