panasonic-laptop: avoid overflow in acpi_pcc_hotkey_add()

num_sifr could go negative since acpi_pcc_get_sqty() returns -EINVAL
on error.  Then it could bypass the sanity check (num_sifr > 255).
The subsequent call to kzalloc() would allocate a small buffer, leading
to a memory corruption.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
index 05be30e..ffff8b4 100644 (file)
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -562,8 +562,8 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 
        num_sifr = acpi_pcc_get_sqty(device);
 
-       if (num_sifr > 255) {
-               ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
+       if (num_sifr < 0 || num_sifr > 255) {
+               ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
                return -ENODEV;
        }