NFC: use after free on error
We returned a freed variable on some error paths when the intent was
to return a NULL. Part of the reason this was missed was that the
code was confusing because it had too many gotos so I removed them
and simplified the flow a bit.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 1e6b20f..4047e29 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -499,19 +499,19 @@
int tx_headroom,
int tx_tailroom)
{
- struct nci_dev *ndev = NULL;
+ struct nci_dev *ndev;
nfc_dbg("entry, supported_protocols 0x%x", supported_protocols);
if (!ops->open || !ops->close || !ops->send)
- goto exit;
+ return NULL;
if (!supported_protocols)
- goto exit;
+ return NULL;
ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
if (!ndev)
- goto exit;
+ return NULL;
ndev->ops = ops;
ndev->tx_headroom = tx_headroom;
@@ -526,13 +526,11 @@
nfc_set_drvdata(ndev->nfc_dev, ndev);
- goto exit;
+ return ndev;
free_exit:
kfree(ndev);
-
-exit:
- return ndev;
+ return NULL;
}
EXPORT_SYMBOL(nci_allocate_device);
