[patch] NFC: use after free on error

* [patch] NFC: use after free on error
@ 2011-09-23  6:14 ` Dan Carpenter
  0 siblings, 0 replies; 4+ messages in thread
From: Dan Carpenter @ 2011-09-23  6:14 UTC (permalink / raw)
  To: Lauro Ramos Venancio
  Cc: Aloisio Almeida Jr, Samuel Ortiz, John W. Linville, Ilan Elias,
	linux-wireless, kernel-janitors

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>

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 895e5fd..06330cd 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -490,19 +490,19 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops,
 					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;
@@ -517,13 +517,11 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops,
 
 	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);
 

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