4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Suren Baghdasaryan surenb@google.com
commit e285d5bfb7e9785d289663baef252dd315e171f8 upstream.
According to ETSI TS 102 622 specification chapter 4.4 pipe identifier is 7 bits long which allows for 128 unique pipe IDs. Because NFC_HCI_MAX_PIPES is used as the number of pipes supported and not as the max pipe ID, its value should be 128 instead of 127.
nfc_hci_recv_from_llc extracts pipe ID from packet header using NFC_HCI_FRAGMENT(0x7F) mask which allows for pipe ID value of 127. Same happens when NCI_HCP_MSG_GET_PIPE() is being used. With pipes array having only 127 elements and pipe ID of 127 the OOB memory access will result.
Cc: Samuel Ortiz sameo@linux.intel.com Cc: Allen Pais allen.pais@oracle.com Cc: "David S. Miller" davem@davemloft.net Suggested-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Suren Baghdasaryan surenb@google.com Reviewed-by: Kees Cook keescook@chromium.org Cc: stable stable@vger.kernel.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/net/nfc/hci.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/net/nfc/hci.h +++ b/include/net/nfc/hci.h @@ -87,7 +87,7 @@ struct nfc_hci_pipe { * According to specification 102 622 chapter 4.4 Pipes, * the pipe identifier is 7 bits long. */ -#define NFC_HCI_MAX_PIPES 127 +#define NFC_HCI_MAX_PIPES 128 struct nfc_hci_init_data { u8 gate_count; struct nfc_hci_gate gates[NFC_HCI_MAX_CUSTOM_GATES];