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authorNguyen Dinh Phi <phind.uet@gmail.com>2023-11-21 10:53:57 +0300
committerDavid S. Miller <davem@davemloft.net>2023-11-22 13:55:48 +0300
commit84d2db91f14a32dc856a5972e3f0907089093c7a (patch)
tree04663e475456a7d28f7a5cdc5aa2c590ef1c344d /drivers/nfc
parentb6fe6f03716da246b453369f98a553d4ab21447c (diff)
downloadlinux-84d2db91f14a32dc856a5972e3f0907089093c7a.tar.xz
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.c7
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;