This is a note to let you know that I've just added the patch titled nfc: st21nfca: fix memory leaks in EVT_TRANSACTION handling to the 5.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nfc-st21nfca-fix-memory-leaks-in-evt_transaction-handling.patch and it can be found in the queue-5.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 996419e0594abb311fb958553809f24f38e7abbe Mon Sep 17 00:00:00 2001 From: Martin Faltesek <mfaltesek@xxxxxxxxxx> Date: Mon, 6 Jun 2022 21:57:28 -0500 Subject: nfc: st21nfca: fix memory leaks in EVT_TRANSACTION handling From: Martin Faltesek <mfaltesek@xxxxxxxxxx> 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@xxxxxxxxxxxxxxx Signed-off-by: Martin Faltesek <mfaltesek@xxxxxxxxxx> Reviewed-by: Guenter Roeck <groeck@xxxxxxxxxxxx> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx> Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -326,22 +326,29 @@ 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); Patches currently in stable-queue which might be from mfaltesek@xxxxxxxxxx are queue-5.18/nfc-st21nfca-fix-incorrect-validating-logic-in-evt_transaction.patch queue-5.18/nfc-st21nfca-fix-memory-leaks-in-evt_transaction-handling.patch queue-5.18/nfc-st21nfca-fix-incorrect-sizing-calculations-in-evt_transaction.patch