From: Dan Carpenter Date: Thu, 19 Aug 2010 08:52:44 +0000 (+0000) Subject: qlge: pull NULL check ahead of dereference X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4da79504b2b41410dd56e9268c9ad403aa65e89c;p=linux-beck.git qlge: pull NULL check ahead of dereference There was a dereference before NULL check issue introduced in 1e213303d "qlge: Add tx multiqueue support." I've pulled the NULL check of "net_rsp" forward a couple lines to avoid that. Also Ron Mercer says that the early exit should be above the index write. ql_write_cq_idx(rx_ring); Signed-off-by: Dan Carpenter Signed-off-by: Ron Mercer Signed-off-by: David S. Miller --- diff --git a/drivers/net/qlge/qlge_main.c b/drivers/net/qlge/qlge_main.c index 8d63f69b27d9..c9f9754f0784 100644 --- a/drivers/net/qlge/qlge_main.c +++ b/drivers/net/qlge/qlge_main.c @@ -2222,10 +2222,11 @@ static int ql_clean_outbound_rx_ring(struct rx_ring *rx_ring) ql_update_cq(rx_ring); prod = ql_read_sh_reg(rx_ring->prod_idx_sh_reg); } + if (!net_rsp) + return 0; ql_write_cq_idx(rx_ring); tx_ring = &qdev->tx_ring[net_rsp->txq_idx]; - if (__netif_subqueue_stopped(qdev->ndev, tx_ring->wq_id) && - net_rsp != NULL) { + if (__netif_subqueue_stopped(qdev->ndev, tx_ring->wq_id)) { if (atomic_read(&tx_ring->queue_stopped) && (atomic_read(&tx_ring->tx_count) > (tx_ring->wq_len / 4))) /*