netdev - [PATCH net 2/7] qed: Prevent creation of too-big u32-chains

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Date:   Tue, 14 Mar 2017 15:25:59 +0200
From:   Yuval Mintz <Yuval.Mintz@...ium.com>
To:     <netdev@...r.kernel.org>
CC:     Tomer Tayar <Tomer.Tayar@...ium.com>,
        Yuval Mintz <Yuval.Mintz@...ium.com>
Subject: [PATCH net 2/7] qed: Prevent creation of too-big u32-chains

From: Tomer Tayar <Tomer.Tayar@...ium.com>

Current Logic would allow the creation of a chain with U32_MAX + 1
elements, when the actual maximum supported by the driver infrastructure
is U32_MAX.

Fixes: a91eb52abb50 ("qed: Revisit chain implementation")
Signed-off-by: Tomer Tayar <Tomer.Tayar@...ium.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@...ium.com>
---
 drivers/net/ethernet/qlogic/qed/qed_dev.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_dev.c b/drivers/net/ethernet/qlogic/qed/qed_dev.c
index e2a081c..e518f91 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_dev.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_dev.c
@@ -2389,9 +2389,8 @@ void qed_chain_free(struct qed_dev *cdev, struct qed_chain *p_chain)
 	 * size/capacity fields are of a u32 type.
 	 */
 	if ((cnt_type == QED_CHAIN_CNT_TYPE_U16 &&
-	     chain_size > 0x10000) ||
-	    (cnt_type == QED_CHAIN_CNT_TYPE_U32 &&
-	     chain_size > 0x100000000ULL)) {
+	     chain_size > ((u32)U16_MAX + 1)) ||
+	    (cnt_type == QED_CHAIN_CNT_TYPE_U32 && chain_size > U32_MAX)) {
 		DP_NOTICE(cdev,
 			  "The actual chain size (0x%llx) is larger than the maximal possible value\n",
 			  chain_size);
-- 
1.9.3