diff options
| author | Nguyen Dinh Phi <phind.uet@gmail.com> | 2023-11-21 08:53:57 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-11-22 11:55:48 +0100 |
| commit | 84d2db91f14a32dc856a5972e3f0907089093c7a (patch) | |
| tree | 04663e475456a7d28f7a5cdc5aa2c590ef1c344d /drivers/nfc | |
| parent | dpll: Fix potential msg memleak when genlmsg_put_reply failed (diff) | |
| download | linux-84d2db91f14a32dc856a5972e3f0907089093c7a.tar.xz linux-84d2db91f14a32dc856a5972e3f0907089093c7a.zip | |
nfc: virtual_ncidev: Add variable to check if ndev is running
syzbot reported an memory leak that happens when an skb is add to
send_buff after virtual nci closed.
This patch adds a variable to track if the ndev is running before
handling new skb in send function.
Signed-off-by: Nguyen Dinh Phi <phind.uet@gmail.com>
Reported-by: syzbot+6eb09d75211863f15e3e@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/lkml/00000000000075472b06007df4fb@google.com
Reviewed-by: Bongsu Jeon
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/nfc')
| -rw-r--r-- | drivers/nfc/virtual_ncidev.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/nfc/virtual_ncidev.c b/drivers/nfc/virtual_ncidev.c index b027be0b0b6f..590b038e449e 100644 --- a/drivers/nfc/virtual_ncidev.c +++ b/drivers/nfc/virtual_ncidev.c @@ -26,10 +26,14 @@ struct virtual_nci_dev { struct mutex mtx; struct sk_buff *send_buff; struct wait_queue_head wq; + bool running; }; static int virtual_nci_open(struct nci_dev *ndev) { + struct virtual_nci_dev *vdev = nci_get_drvdata(ndev); + + vdev->running = true; return 0; } @@ -40,6 +44,7 @@ static int virtual_nci_close(struct nci_dev *ndev) mutex_lock(&vdev->mtx); kfree_skb(vdev->send_buff); vdev->send_buff = NULL; + vdev->running = false; mutex_unlock(&vdev->mtx); return 0; @@ -50,7 +55,7 @@ static int virtual_nci_send(struct nci_dev *ndev, struct sk_buff *skb) struct virtual_nci_dev *vdev = nci_get_drvdata(ndev); mutex_lock(&vdev->mtx); - if (vdev->send_buff) { + if (vdev->send_buff || !vdev->running) { mutex_unlock(&vdev->mtx); kfree_skb(skb); return -1; |