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authorMartin Faltesek <mfaltesek@google.com>2022-06-07 05:57:28 +0300
committerJakub Kicinski <kuba@kernel.org>2022-06-08 20:17:17 +0300
commit996419e0594abb311fb958553809f24f38e7abbe (patch)
tree8c0d7fc1098726739cdfa80d4d349020b877fc8f /drivers/nfc
parent77e5fe8f176a525523ae091d6fd0fbb8834c156d (diff)
downloadlinux-996419e0594abb311fb958553809f24f38e7abbe.tar.xz
nfc: st21nfca: fix memory leaks in EVT_TRANSACTION handling
Error paths do not free previously allocated memory. Add devm_kfree() to those failure paths. Fixes: 26fc6c7f02cb ("NFC: st21nfca: Add HCI transaction event support") Fixes: 4fbcc1a4cb20 ("nfc: st21nfca: Fix potential buffer overflows in EVT_TRANSACTION") Cc: stable@vger.kernel.org Signed-off-by: Martin Faltesek <mfaltesek@google.com> Reviewed-by: Guenter Roeck <groeck@chromium.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/nfc')
-rw-r--r--drivers/nfc/st21nfca/se.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/nfc/st21nfca/se.c b/drivers/nfc/st21nfca/se.c
index 9645777f2544..8e1113ce139b 100644
--- a/drivers/nfc/st21nfca/se.c
+++ b/drivers/nfc/st21nfca/se.c
@@ -326,22 +326,29 @@ int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host,
transaction->aid_len = skb->data[1];
/* Checking if the length of the AID is valid */
- if (transaction->aid_len > sizeof(transaction->aid))
+ if (transaction->aid_len > sizeof(transaction->aid)) {
+ devm_kfree(dev, transaction);
return -EINVAL;
+ }
memcpy(transaction->aid, &skb->data[2],
transaction->aid_len);
/* Check next byte is PARAMETERS tag (82) */
if (skb->data[transaction->aid_len + 2] !=
- NFC_EVT_TRANSACTION_PARAMS_TAG)
+ NFC_EVT_TRANSACTION_PARAMS_TAG) {
+ devm_kfree(dev, transaction);
return -EPROTO;
+ }
transaction->params_len = skb->data[transaction->aid_len + 3];
/* Total size is allocated (skb->len - 2) minus fixed array members */
- if (transaction->params_len > ((skb->len - 2) - sizeof(struct nfc_evt_transaction)))
+ if (transaction->params_len > ((skb->len - 2) -
+ sizeof(struct nfc_evt_transaction))) {
+ devm_kfree(dev, transaction);
return -EINVAL;
+ }
memcpy(transaction->params, skb->data +
transaction->aid_len + 4, transaction->params_len);