| Message ID | 20230516150427.79469-1-pchelkin@ispras.ru |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] wifi: ath9k: don't allow to overwrite ENDPOINT0 attributes | expand |
Fedor Pchelkin <pchelkin@ispras.ru> writes: > A bad USB device is able to construct a service connection response > message with target endpoint being ENDPOINT0 which is reserved for > HTC_CTRL_RSVD_SVC and should not be modified to be used for any other > services. > > Reject such service connection responses. > > Found by Linux Verification Center (linuxtesting.org) with Syzkaller. > > Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") > Reported-by: syzbot+b68fbebe56d8362907e8@syzkaller.appspotmail.com > Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru> Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Fedor Pchelkin <pchelkin@ispras.ru> wrote: > A bad USB device is able to construct a service connection response > message with target endpoint being ENDPOINT0 which is reserved for > HTC_CTRL_RSVD_SVC and should not be modified to be used for any other > services. > > Reject such service connection responses. > > Found by Linux Verification Center (linuxtesting.org) with Syzkaller. > > Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") > Reported-by: syzbot+b68fbebe56d8362907e8@syzkaller.appspotmail.com > Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru> > Acked-by: Toke Høiland-Jørgensen <toke@toke.dk> > Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> Patch applied to ath-next branch of ath.git, thanks. 061b0cb9327b wifi: ath9k: don't allow to overwrite ENDPOINT0 attributes
diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c index fe62ff668f75..99667aba289d 100644 --- a/drivers/net/wireless/ath/ath9k/htc_hst.c +++ b/drivers/net/wireless/ath/ath9k/htc_hst.c @@ -114,7 +114,13 @@ static void htc_process_conn_rsp(struct htc_target *target, if (svc_rspmsg->status == HTC_SERVICE_SUCCESS) { epid = svc_rspmsg->endpoint_id; - if (epid < 0 || epid >= ENDPOINT_MAX) + + /* Check that the received epid for the endpoint to attach + * a new service is valid. ENDPOINT0 can't be used here as it + * is already reserved for HTC_CTRL_RSVD_SVC service and thus + * should not be modified. + */ + if (epid <= ENDPOINT0 || epid >= ENDPOINT_MAX) return; service_id = be16_to_cpu(svc_rspmsg->service_id);
A bad USB device is able to construct a service connection response message with target endpoint being ENDPOINT0 which is reserved for HTC_CTRL_RSVD_SVC and should not be modified to be used for any other services. Reject such service connection responses. Found by Linux Verification Center (linuxtesting.org) with Syzkaller. Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") Reported-by: syzbot+b68fbebe56d8362907e8@syzkaller.appspotmail.com Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru> --- v2: per Toke's remark, use ENDPOINT0 macro and give a comment explaining why it should be checked. drivers/net/wireless/ath/ath9k/htc_hst.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)