netdev - [PATCH iwl-next v3 1/3] ice: ice_aq_check_events: fix off-by-one check when filling buffer

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Date: Mon,  7 Aug 2023 11:58:46 -0400
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org,
	Jacob Keller <jacob.e.keller@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Simon Horman <horms@...nel.org>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>
Subject: [PATCH iwl-next v3 1/3] ice: ice_aq_check_events: fix off-by-one check when filling buffer

Allow task's event buffer to be filled also in the case that it's size
is exactly the size of the message.

Fixes: d69ea414c9b4 ("ice: implement device flash update via devlink")
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index a73895483e6c..f2ad2153589a 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -1357,7 +1357,9 @@ int ice_aq_wait_for_event(struct ice_pf *pf, u16 opcode, unsigned long timeout,
 static void ice_aq_check_events(struct ice_pf *pf, u16 opcode,
 				struct ice_rq_event_info *event)
 {
+	struct ice_rq_event_info *task_ev;
 	struct ice_aq_task *task;
+
 	bool found = false;
 
 	spin_lock_bh(&pf->aq_wait_lock);
@@ -1365,15 +1367,15 @@ static void ice_aq_check_events(struct ice_pf *pf, u16 opcode,
 		if (task->state || task->opcode != opcode)
 			continue;
 
-		memcpy(&task->event->desc, &event->desc, sizeof(event->desc));
-		task->event->msg_len = event->msg_len;
+		task_ev = task->event;
+		memcpy(&task_ev->desc, &event->desc, sizeof(event->desc));
+		task_ev->msg_len = event->msg_len;
 
 		/* Only copy the data buffer if a destination was set */
-		if (task->event->msg_buf &&
-		    task->event->buf_len > event->buf_len) {
-			memcpy(task->event->msg_buf, event->msg_buf,
+		if (task_ev->msg_buf && task_ev->buf_len >= event->buf_len) {
+			memcpy(task_ev->msg_buf, event->msg_buf,
 			       event->buf_len);
-			task->event->buf_len = event->buf_len;
+			task_ev->buf_len = event->buf_len;
 		}
 
 		task->state = ICE_AQ_TASK_COMPLETE;
-- 
2.40.1