From: Martin Faltesek mfaltesek@google.com
commit 996419e0594abb311fb958553809f24f38e7abbe upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/nfc/st21nfca/se.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
--- a/drivers/nfc/st21nfca/se.c +++ b/drivers/nfc/st21nfca/se.c @@ -331,22 +331,29 @@ int st21nfca_connectivity_event_received 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);