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wifi: ath9k: don't allow to overwrite ENDPOINT0 attributes

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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: fb9987d0f7 ("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>
Link: https://lore.kernel.org/r/20230516150427.79469-1-pchelkin@ispras.ru
This commit is contained in:
Fedor Pchelkin 2023-05-17 18:03:17 +03:00 committed by Kalle Valo
parent 27044b57f8
commit 061b0cb932
1 changed files with 7 additions and 1 deletions
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8
drivers/net/wireless/ath/ath9k/htc_hst.c
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@ -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);