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SubjectRe: [PATCH] mailbox: PCC: handle parse error
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On 08/27/2018 01:19 PM, David Arcari wrote:
> acpi_pcc_probe calls acpi_table_parse_entries_array but fails to check
> for an error return. This in turn can result in calling kcalloc with
> a negative count as well as emitting the following misleading erorr
> message:
>
> [ 2.642015] Could not allocate space for PCC mbox channels
>
> Fixes: 8f8027c5f935 ("mailbox: PCC: erroneous error message when parsing ACPI PCCT")
>
> Signed-off-by: David Arcari <darcari@redhat.com>
> Cc: Al Stone <ahs3@redhat.com>
> Cc: Jassi Brar <jassisinghbrar@gmail.com>
> ---
> drivers/mailbox/pcc.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
> index 311e91b..256f18b 100644
> --- a/drivers/mailbox/pcc.c
> +++ b/drivers/mailbox/pcc.c
> @@ -461,8 +461,11 @@ 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) {
> - pr_warn("Invalid PCCT: %d PCC subspaces\n", count);
> + if (count <= 0 || count > MAX_PCC_SUBSPACES) {
> + if (count < 0)
> + pr_warn("Error parsing PCC subspaces from PCCT\n");
> + else
> + pr_warn("Invalid PCCT: %d PCC subspaces\n", count);
> return -EINVAL;
> }
>
>

Thanks, David. Nice catch.

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

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

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