2015-06-01 00:44:48

by Joe Perches

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

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 <[email protected]>
---
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);

2015-06-08 21:49:37

by Samuel Ortiz

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

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 <[email protected]>
> ---
> net/nfc/nci/hci.c | 11 +++--------
> 1 file changed, 3 insertions(+), 8 deletions(-)
Applied to nfc-next, thanks.

Cheers,
Samuel.