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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Venkat Devvuru <venkatkumar.duvvuru@broadcom.com>,
        Michael Chan <michael.chan@broadcom.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.4 26/34] bnxt_en: Fix the Invalid VF id check in bnxt_vf_ndo_prep routine.
Date:   Fri,  2 Mar 2018 09:51:22 +0100
Message-Id: <20180302084437.693698886@linuxfoundation.org>
In-Reply-To: <20180302084435.842679610@linuxfoundation.org>
References: <20180302084435.842679610@linuxfoundation.org>
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4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>


[ Upstream commit 78f300049335ae81a5cc6b4b232481dc5e1f9d41 ]

In bnxt_vf_ndo_prep (which is called by bnxt_get_vf_config ndo), there is a
check for "Invalid VF id". Currently, the check is done against max_vfs.
However, the user doesn't always create max_vfs. So, the check should be
against the created number of VFs. The number of bnxt_vf_info structures
that are allocated in bnxt_alloc_vf_resources routine is the "number of
requested VFs". So, if an "invalid VF id" falls between the requested
number of VFs and the max_vfs, the driver will be dereferencing an invalid
pointer.

Fixes: c0c050c58d84 ("bnxt_en: New Broadcom ethernet driver.")
Signed-off-by: Venkat Devvuru <venkatkumar.duvvuru@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
@@ -29,7 +29,7 @@ static int bnxt_vf_ndo_prep(struct bnxt
 		netdev_err(bp->dev, "vf ndo called though sriov is disabled\n");
 		return -EINVAL;
 	}
-	if (vf_id >= bp->pf.max_vfs) {
+	if (vf_id >= bp->pf.active_vfs) {
 		netdev_err(bp->dev, "Invalid VF id %d\n", vf_id);
 		return -EINVAL;
 	}