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SubjectRe: [PATCH][next] mailbox: PCC: check for negative count for parse failure checking
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On 05/30/2018 11:14 AM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> The function acpi_table_parse_enties_array can potentially return a
> negative value if parsing fails. Currently the check on the return
> is not checking for errors, so fix this by adding a -ve check too.
>
> Detected by CoverityScan, CID#1469477 ("Improper use of negative value")
>
> Fixes: 8f8027c5f935 ("mailbox: PCC: erroneous error message when parsing ACPI PCCT")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> drivers/mailbox/pcc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
> index fc3c237daef2..87d67922020d 100644
> --- a/drivers/mailbox/pcc.c
> +++ b/drivers/mailbox/pcc.c
> @@ -461,7 +461,7 @@ static int __init acpi_pcc_probe(void)
> count = acpi_table_parse_entries_array(ACPI_SIG_PCCT,
> sizeof(struct acpi_table_pcct), proc,
> ACPI_PCCT_TYPE_RESERVED, MAX_PCC_SUBSPACES);
> - if (count == 0 || count > MAX_PCC_SUBSPACES) {
> + if (count <= 0 || count > MAX_PCC_SUBSPACES) {
> pr_warn("Invalid PCCT: %d PCC subspaces\n", count);
> return -EINVAL;
> }
>

Yup, nice catch. A little paranoid, but we like that in a kernel :). Thanks.

Reviewed-by: Al Stone <ahs3@redhat.com>

--
ciao,
al
-----------------------------------
Al Stone
Software Engineer
Red Hat, Inc.
ahs3@redhat.com
-----------------------------------

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