[PATCH] efi: cper: check section header more appropriately

[PATCH] efi: cper: check section header more appropriately

[Shuai Xue]

When checking a generic status block, we iterate over all the generic data
blocks. The loop condition checks that the generic data block is valid.
Because the size of data blocks (excluding error data) may vary depending
on the revision and the revision is contained within the data block, we
should ensure that enough of the current data block is valid appropiriately
for different revision.

Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
---
 drivers/firmware/efi/cper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index e15d484b6a5a..e80706d9e78a 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -635,7 +635,7 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
 	data_len = estatus->data_length;
 
 	apei_estatus_for_each_section(estatus, gdata) {
-		if (sizeof(struct acpi_hest_generic_data) > data_len)
+		if (acpi_hest_get_size(gdata) > data_len)
 			return -EINVAL;
 
 		record_size = acpi_hest_get_record_size(gdata);
-- 
2.20.1.12.g72788fdb

Re: [PATCH] efi: cper: check section header more appropriately

[Ard Biesheuvel]

On Mon, 23 Aug 2021 at 13:57, Shuai Xue <xueshuai@linux.alibaba.com> wrote:
>
> When checking a generic status block, we iterate over all the generic data
> blocks. The loop condition checks that the generic data block is valid.
> Because the size of data blocks (excluding error data) may vary depending
> on the revision and the revision is contained within the data block, we
> should ensure that enough of the current data block is valid appropiriately
> for different revision.
>
> Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>

Applied, thanks.

> ---
>  drivers/firmware/efi/cper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index e15d484b6a5a..e80706d9e78a 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -635,7 +635,7 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>         data_len = estatus->data_length;
>
>         apei_estatus_for_each_section(estatus, gdata) {
> -               if (sizeof(struct acpi_hest_generic_data) > data_len)
> +               if (acpi_hest_get_size(gdata) > data_len)
>                         return -EINVAL;
>
>                 record_size = acpi_hest_get_record_size(gdata);
> --
> 2.20.1.12.g72788fdb
>