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| author | Fedor Pchelkin <pchelkin@ispras.ru> | 2023-02-25 13:56:14 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-02-26 14:55:13 +0000 |
| commit | 25ff6f8a5a3b8dc48e8abda6f013e8cc4b14ffea (patch) | |
| tree | 51a9c9f0cc736d90bc3d1cfc12f91e25472a8a96 /drivers/nfc | |
| parent | cf871006c01709211f2620a33de37257362a05e8 (diff) | |
| download | lwn-25ff6f8a5a3b8dc48e8abda6f013e8cc4b14ffea.tar.gz lwn-25ff6f8a5a3b8dc48e8abda6f013e8cc4b14ffea.zip | |
nfc: fix memory leak of se_io context in nfc_genl_se_io
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@syzkaller.appspotmail.com
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/nfc')
| -rw-r--r-- | drivers/nfc/st-nci/se.c | 6 | ||||
| -rw-r--r-- | drivers/nfc/st21nfca/se.c | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/nfc/st-nci/se.c b/drivers/nfc/st-nci/se.c index ec87dd21e054..b2f1ced8e6dd 100644 --- a/drivers/nfc/st-nci/se.c +++ b/drivers/nfc/st-nci/se.c @@ -672,6 +672,12 @@ 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 df8d27cf2956..dae288bebcb5 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; } } |