From: Dan Carpenter Date: Tue, 27 Aug 2013 01:16:22 +0000 (+0300) Subject: qlcnic: underflow in qlcnic_validate_max_tx_rings() X-Git-Tag: upstream/snapshot3+hdmi~4422^2~164 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=80b17be70b63646cb141bf1826afe32281e561ec;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git qlcnic: underflow in qlcnic_validate_max_tx_rings() This function checks the upper bound but it doesn't check for negative numbers: if (txq > QLCNIC_MAX_TX_RINGS) { I've solved this by making "txq" a u32 type. I chose that because ->tx_count in the ethtool_channels struct is a __u32. This bug was added in aa4a1f7df7 ('qlcnic: Enable Tx queue changes using ethtool for 82xx Series adapter.'). Signed-off-by: Dan Carpenter Acked-by: Himanshu Madhani Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h index 156a78e..22bd425 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h @@ -1542,7 +1542,7 @@ int qlcnic_diag_alloc_res(struct net_device *netdev, int test); netdev_tx_t qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev); int qlcnic_set_max_rss(struct qlcnic_adapter *, u8, int); int qlcnic_validate_max_rss(struct qlcnic_adapter *, __u32); -int qlcnic_validate_max_tx_rings(struct qlcnic_adapter *, int); +int qlcnic_validate_max_tx_rings(struct qlcnic_adapter *, u32 txq); void qlcnic_alloc_lb_filters_mem(struct qlcnic_adapter *adapter); void qlcnic_82xx_set_mac_filter_count(struct qlcnic_adapter *); int qlcnic_enable_msix(struct qlcnic_adapter *, u32); diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c index df96f66..7dde3ba 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c @@ -3548,7 +3548,7 @@ qlcnicvf_start_firmware(struct qlcnic_adapter *adapter) return err; } -int qlcnic_validate_max_tx_rings(struct qlcnic_adapter *adapter, int txq) +int qlcnic_validate_max_tx_rings(struct qlcnic_adapter *adapter, u32 txq) { struct net_device *netdev = adapter->netdev; u8 max_hw = QLCNIC_MAX_TX_RINGS;