media: dm1105: Limit number of cards to avoid buffer over read

dm1105_probe() counts number of cards at dm1105_devcount,
but missed bounds check before dereference a card array.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/pci/dm1105/dm1105.c b/drivers/media/pci/dm1105/dm1105.c
index c9db108751a73117c4f7033c31c4cbddc7cf3bbe..1ddb0576fb7b1af37d8c681d925df6260bc2ff4a 100644 (file)
--- a/drivers/media/pci/dm1105/dm1105.c
+++ b/drivers/media/pci/dm1105/dm1105.c
@@ -986,6 +986,9 @@ static int dm1105_probe(struct pci_dev *pdev,
        int ret = -ENOMEM;
        int i;
 
+       if (dm1105_devcount >= ARRAY_SIZE(card))
+               return -ENODEV;
+
        dev = kzalloc(sizeof(struct dm1105_dev), GFP_KERNEL);
        if (!dev)
                return -ENOMEM;