Jeongjun Park <aha310510@xxxxxxxxx> writes: > I found the following bug in my fuzzer: > > UBSAN: array-index-out-of-bounds in drivers/net/wireless/ath/ath9k/htc_hst.c:26:51 > index 255 is out of range for type 'htc_endpoint [22]' > CPU: 0 UID: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.11.0-rc6-dirty #14 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 > Workqueue: events request_firmware_work_func > Call Trace: > <TASK> > dump_stack_lvl+0x180/0x1b0 > __ubsan_handle_out_of_bounds+0xd4/0x130 > htc_issue_send.constprop.0+0x20c/0x230 > ? _raw_spin_unlock_irqrestore+0x3c/0x70 > ath9k_wmi_cmd+0x41d/0x610 > ? mark_held_locks+0x9f/0xe0 > ... > > Since this bug has been confirmed to be caused by insufficient verification > of conn_rsp_epid, I think it would be appropriate to add a range check for > conn_rsp_epid to htc_connect_service() to prevent the bug from occurring. > > Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") > Signed-off-by: Jeongjun Park <aha310510@xxxxxxxxx> > --- > drivers/net/wireless/ath/ath9k/htc_hst.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c > index eb631fd3336d..aedba5f79bfb 100644 > --- a/drivers/net/wireless/ath/ath9k/htc_hst.c > +++ b/drivers/net/wireless/ath/ath9k/htc_hst.c > @@ -293,6 +293,8 @@ int htc_connect_service(struct htc_target *target, > service_connreq->service_id); > return -ETIMEDOUT; > } > + if (target->conn_rsp_epid < 0 || target->conn_rsp_epid >= ENDPOINT_MAX) > + return -EINVAL; nit: please add a blank line after the }, and get rid of the extra space at the end of the line with the if statement. Otherwise, the patch LGTM. -Toke