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SubjectRe: [PATCH] mailbox: PCC: handle parse error
Date
On Monday, August 27, 2018 10:55:41 PM CEST Al Stone wrote:
> 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>

Patch applied, thanks!

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