| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.18 317/339] nfc: st21nfca: fix incorrect validating logic in EVT_TRANSACTION | Date | Mon, 13 Jun 2022 12:12:22 +0200 |
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From: Martin Faltesek <mfaltesek@google.com>
commit 77e5fe8f176a525523ae091d6fd0fbb8834c156d upstream.
The first validation check for EVT_TRANSACTION has two different checks tied together with logical AND. One is a check for minimum packet length, and the other is for a valid aid_tag. If either condition is true (fails), then an error should be triggered. The fix is to change && to ||.
Fixes: 26fc6c7f02cb ("NFC: st21nfca: Add HCI transaction event support") 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 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/nfc/st21nfca/se.c +++ b/drivers/nfc/st21nfca/se.c @@ -315,7 +315,7 @@ int st21nfca_connectivity_event_received * AID 81 5 to 16 * PARAMETERS 82 0 to 255 */ - if (skb->len < NFC_MIN_AID_LENGTH + 2 && + if (skb->len < NFC_MIN_AID_LENGTH + 2 || skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG) return -EPROTO;
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