Re: [PATCH][next] efi/tpm: fix sanity check of unsigned tbl_size being less than zero

Jerry Snitselaar
2019-10-08T15:47:51Z

On Tue Oct 08 19, Colin King wrote:
>From: Colin Ian King <colin.king@canonical.com>
>
>Currently the check for tbl_size being less than zero is always false
>because tbl_size is unsigned. Fix this by making it a signed int.
>
>Addresses-Coverity: ("Unsigned compared against 0")
>Fixes: e658c82be556 ("efi/tpm: Only set 'efi_tpm_final_log_size' after successful event log parsing")
>Signed-off-by: Colin Ian King <colin.king@canonical.com>
>---
> drivers/firmware/efi/tpm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c
>index 703469c1ab8e..ebd7977653a8 100644
>--- a/drivers/firmware/efi/tpm.c
>+++ b/drivers/firmware/efi/tpm.c
>@@ -40,7 +40,7 @@ int __init efi_tpm_eventlog_init(void)
> {
> struct linux_efi_tpm_eventlog *log_tbl;
> struct efi_tcg2_final_events_table *final_tbl;
>- unsigned int tbl_size;
>+ int tbl_size;
> int ret = 0;
>
> if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {
>--
>2.20.1
>

Thanks for catching that. Somehow I dropped it from v2 to v3.