[PATCH] NFC: nci: hci: Fix releasing uninitialized skbs

[PATCH] NFC: nci: hci: Fix releasing uninitialized skbs

[Joe Perches]

Several of these goto exit; uses should be direct returns
as skb is not yet initialized by nci_hci_get_param().

Miscellanea:

o Use !memcmp instead of memcmp() == 0
o Remove unnecessary goto from if () {... goto exit;} else {...} exit:

Signed-off-by: Joe Perches <joe-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org>
---
 net/nfc/nci/hci.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/net/nfc/nci/hci.c b/net/nfc/nci/hci.c
index ed54ec5..af002df 100644
--- a/net/nfc/nci/hci.c
+++ b/net/nfc/nci/hci.c
@@ -639,22 +639,19 @@ int nci_hci_dev_session_init(struct nci_dev *ndev)
 				 ndev->hci_dev->init_data.gates[0].gate,
 				 ndev->hci_dev->init_data.gates[0].pipe);
 	if (r < 0)
-		goto exit;
+		return r;
 
 	r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 			      NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
 	if (r < 0)
-		goto exit;
+		return r;
 
 	if (skb->len &&
 	    skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
-	    memcmp(ndev->hci_dev->init_data.session_id,
-		   skb->data, skb->len) == 0 &&
+	    !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
 	    ndev->ops->hci_load_session) {
 		/* Restore gate<->pipe table from some proprietary location. */
 		r = ndev->ops->hci_load_session(ndev);
-		if (r < 0)
-			goto exit;
 	} else {
 		r = nci_hci_dev_connect_gates(ndev,
 					      ndev->hci_dev->init_data.gate_count,
@@ -667,8 +664,6 @@ int nci_hci_dev_session_init(struct nci_dev *ndev)
 				      ndev->hci_dev->init_data.session_id,
 				      strlen(ndev->hci_dev->init_data.session_id));
 	}
-	if (r == 0)
-		goto exit;
 
 exit:
 	kfree_skb(skb);


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Re: [PATCH] NFC: nci: hci: Fix releasing uninitialized skbs

[Samuel Ortiz]

Hi Joe,

On Sun, May 31, 2015 at 05:44:45PM -0700, Joe Perches wrote:
> Several of these goto exit; uses should be direct returns
> as skb is not yet initialized by nci_hci_get_param().
> 
> Miscellanea:
> 
> o Use !memcmp instead of memcmp() == 0
> o Remove unnecessary goto from if () {... goto exit;} else {...} exit:
> 
> Signed-off-by: Joe Perches <joe@perches.com>
> ---
>  net/nfc/nci/hci.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
Applied to nfc-next, thanks.

Cheers,
Samuel.