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| author | David Arcari <darcari@redhat.com> | 2018-08-27 15:19:08 -0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-09-10 12:54:02 +0200 |
| commit | afd0b1fb22269f48d68fdf269891c653818c8047 (patch) | |
| tree | 35c570aa7256f5f6aa8e3a2a4af2690819d79c00 /drivers/mailbox | |
| parent | 11da3a7f84f19c26da6f86af878298694ede0804 (diff) | |
| download | linux-afd0b1fb22269f48d68fdf269891c653818c8047.tar.gz linux-afd0b1fb22269f48d68fdf269891c653818c8047.tar.bz2 linux-afd0b1fb22269f48d68fdf269891c653818c8047.zip | |
mailbox: PCC: handle parse error
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>
Reviewed-by: Al Stone <ahs3@redhat.com>
Cc: 4.18+ <stable@vger.kernel.org> # 4.18+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/mailbox')
| -rw-r--r-- | drivers/mailbox/pcc.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c index 311e91b1a14f..256f18b67e8a 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; } |