From: Fedor Pchelkin <pchelkin@xxxxxxxxx>
[ Upstream commit 25ff6f8a5a3b8dc48e8abda6f013e8cc4b14ffea ]
The callback context for sending/receiving APDUs to/from the selected
secure element is allocated inside nfc_genl_se_io and supposed to be
eventually freed in se_io_cb callback function. However, there are several
error paths where the bwi_timer is not charged to call se_io_cb later, and
the cb_context is leaked.
The patch proposes to free the cb_context explicitly on those error paths.
At the moment we can't simply check 'dev->ops->se_io()' return value as it
may be negative in both cases: when the timer was charged and was not.
Fixes: 5ce3f32b5264 ("NFC: netlink: SE API implementation")
Reported-by: syzbot+df64c0a2e8d68e78a4fa@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
Signed-off-by: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/nfc/st-nci/se.c | 6 ++++++
drivers/nfc/st21nfca/se.c | 6 ++++++
net/nfc/netlink.c | 4 ++++
3 files changed, 16 insertions(+)
diff --git a/drivers/nfc/st-nci/se.c b/drivers/nfc/st-nci/se.c
index 37d397aae9b9d..a14afceaf5e92 100644
--- a/drivers/nfc/st-nci/se.c
+++ b/drivers/nfc/st-nci/se.c
@@ -664,6 +664,12 @@ int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
ST_NCI_EVT_TRANSMIT_DATA, apdu,
apdu_length);
default:
+ /* Need to free cb_context here as at the moment we can't
+ * clearly indicate to the caller if the callback function
+ * would be called (and free it) or not. In both cases a
+ * negative value may be returned to the caller.
+ */
+ kfree(cb_context);
return -ENODEV;
}
}
diff --git a/drivers/nfc/st21nfca/se.c b/drivers/nfc/st21nfca/se.c
index d416365042462..6a1d3b2752fbf 100644
--- a/drivers/nfc/st21nfca/se.c
+++ b/drivers/nfc/st21nfca/se.c
@@ -236,6 +236,12 @@ int st21nfca_hci_se_io(struct nfc_hci_dev *hdev, u32 se_idx,
ST21NFCA_EVT_TRANSMIT_DATA,
apdu, apdu_length);
default:
+ /* Need to free cb_context here as at the moment we can't
+ * clearly indicate to the caller if the callback function
+ * would be called (and free it) or not. In both cases a
+ * negative value may be returned to the caller.
+ */
+ kfree(cb_context);
return -ENODEV;
}
}
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 610caea4feec8..3f4785be066a8 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1442,7 +1442,11 @@ static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
rc = dev->ops->se_io(dev, se_idx, apdu,
apdu_length, cb, cb_context);
+ device_unlock(&dev->dev);
+ return rc;
+
error:
+ kfree(cb_context);
device_unlock(&dev->dev);
return rc;
}
--
2.39.2
