[PATCH 5.10 102/406] ice: ice_aq_check_events: fix off-by-one check when filling buffer

Greg Kroah-Hartman
2023-09-17T19:24:10Z

From: Przemek Kitszel <przemyslaw.kitszel@intel.com>

[ Upstream commit e1e8a142c43336e3d25bfa1cb3a4ae7d00875c48 ]

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")
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/intel/ice/ice_main.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 4f0d63fa5709b..d2ee760f92942 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -1137,6 +1137,7 @@ 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;

@@ -1145,15 +1146,15 @@ 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