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From: Stephen Hemminger <stephen@networkplumber.org>
To: ajit.khaparde@broadcom.com, somnath.kotur@broadcom.com
Cc: dev@dpdk.org, Stephen Hemminger <stephen@networkplumber.org>,
	Christopher Ertl <Christopher.Ertl@microsoft.com>
Subject: [dpdk-dev] [PATCH 6/6] net/bnxt: sanitize max_l2_ctx
Date: Tue,  3 Mar 2020 09:59:38 -0800
Message-ID: <20200303175938.14292-7-stephen@networkplumber.org> (raw)
In-Reply-To: <20200303175938.14292-1-stephen@networkplumber.org>

If max_l2_ctx is very large, then adding the additional value
could cause wraparound.

Reported-by: Christopher Ertl <Christopher.Ertl@microsoft.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/bnxt/bnxt_hwrm.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index d878320aa110..099e04fa550a 100644
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -651,8 +651,15 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 	bp->first_vf_id = rte_le_to_cpu_16(resp->first_vf_id);
 	bp->max_rx_em_flows = rte_le_to_cpu_16(resp->max_rx_em_flows);
 	bp->max_l2_ctx = rte_le_to_cpu_16(resp->max_l2_ctxs);
-	if (!BNXT_CHIP_THOR(bp))
-		bp->max_l2_ctx += bp->max_rx_em_flows;
+	if (!BNXT_CHIP_THOR(bp)) {
+		uint16_t max_l2_ctx;
+
+		if (rte_add_overflow(bp->max_l2_ctx, bp->max_rx_em_flows,
+				     &max_l2_ctx))
+			return -EINVAL;
+		bp->max_l2_ctx = max_l2_ctx;
+	}
+
 	/* TODO: For now, do not support VMDq/RFS on VFs. */
 	if (BNXT_PF(bp)) {
 		if (bp->pf.max_vfs)
-- 
2.20.1


  parent reply	other threads:[~2020-03-03 18:00 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-03 17:59 [dpdk-dev] [PATCH 0/6] net/bnxt: bounds checking patches Stephen Hemminger
2020-03-03 17:59 ` [dpdk-dev] [PATCH 1/6] eal: add portable way to check for math overflow Stephen Hemminger
2020-03-03 22:28   ` Dmitry Kozlyuk
2020-03-03 17:59 ` [dpdk-dev] [PATCH 2/6] net/bnxt: fix potential data race Stephen Hemminger
2020-03-03 18:13   ` [dpdk-dev] [EXTERNAL] " Christopher Ertl
2020-03-03 18:16     ` Stephen Hemminger
2020-03-03 17:59 ` [dpdk-dev] [PATCH 3/6] net/bnxt: avoid potential out of bounds read Stephen Hemminger
2020-03-03 17:59 ` [dpdk-dev] [PATCH 4/6] net/bnxt: check for integer overflow in buffer sizing Stephen Hemminger
2020-03-03 17:59 ` [dpdk-dev] [PATCH 5/6] net/bnxt: add integer underflow check Stephen Hemminger
2020-03-03 17:59 ` Stephen Hemminger [this message]
2020-03-31 11:47 ` [dpdk-dev] [PATCH 0/6] net/bnxt: bounds checking patches Ferruh Yigit
2020-03-31 17:52   ` Ajit Khaparde
2020-03-31 18:04     ` Stephen Hemminger
2020-10-19 22:28       ` Thomas Monjalon

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