6.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bob Pearson <rpearsonhpe@xxxxxxxxx> [ Upstream commit 5993b75d0bc71cd2b441d174b028fc36180f032c ] If create_qp does not fully succeed it is possible for qp cleanup code to attempt to drain the send or recv work queues before the queues have been created causing a seg fault. This patch checks to see if the queues exist before attempting to drain them. Link: https://lore.kernel.org/r/20230620135519.9365-3-rpearsonhpe@xxxxxxxxx Reported-by: syzbot+2da1965168e7dbcba136@xxxxxxxxxxxxxxxxxxxxxxxxx Closes: https://lore.kernel.org/linux-rdma/00000000000012d89205fe7cfe00@xxxxxxxxxx/raw Fixes: 49dc9c1f0c7e ("RDMA/rxe: Cleanup reset state handling in rxe_resp.c") Fixes: fbdeb828a21f ("RDMA/rxe: Cleanup error state handling in rxe_comp.c") Signed-off-by: Bob Pearson <rpearsonhpe@xxxxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/infiniband/sw/rxe/rxe_comp.c | 4 ++++ drivers/infiniband/sw/rxe/rxe_resp.c | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/drivers/infiniband/sw/rxe/rxe_comp.c b/drivers/infiniband/sw/rxe/rxe_comp.c index f46c5a5fd0aea..44fece204abdd 100644 --- a/drivers/infiniband/sw/rxe/rxe_comp.c +++ b/drivers/infiniband/sw/rxe/rxe_comp.c @@ -597,6 +597,10 @@ static void flush_send_queue(struct rxe_qp *qp, bool notify) struct rxe_queue *q = qp->sq.queue; int err; + /* send queue never got created. nothing to do. */ + if (!qp->sq.queue) + return; + while ((wqe = queue_head(q, q->type))) { if (notify) { err = flush_send_wqe(qp, wqe); diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c index ee68306555b99..ed5af55237d9f 100644 --- a/drivers/infiniband/sw/rxe/rxe_resp.c +++ b/drivers/infiniband/sw/rxe/rxe_resp.c @@ -1452,6 +1452,10 @@ static void flush_recv_queue(struct rxe_qp *qp, bool notify) if (qp->srq) return; + /* recv queue not created. nothing to do. */ + if (!qp->rq.queue) + return; + while ((wqe = queue_head(q, q->type))) { if (notify) { err = flush_recv_wqe(qp, wqe); -- 2.40.1
