linux-kernel - [PATCH 4.9 13/51] net/mlx4: Fix UBSAN warning of signed integer overflow

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Message-Id: <20181211151613.965430806@linuxfoundation.org>
Date:   Tue, 11 Dec 2018 16:41:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Aya Levin <ayal@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 13/51] net/mlx4: Fix UBSAN warning of signed integer overflow

4.9-stable review patch.  If anyone has any objections, please let me know.

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

[ Upstream commit a463146e67c848cbab5ce706d6528281b7cded08 ]

UBSAN: Undefined behavior in
drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:626:29
signed integer overflow: 1802201963 + 1802201963 cannot be represented
in type 'int'

The union of res_reserved and res_port_rsvd[MLX4_MAX_PORTS] monitors
granting of reserved resources. The grant operation is calculated and
protected, thus both members of the union cannot be negative.  Changed
type of res_reserved and of res_port_rsvd[MLX4_MAX_PORTS] from signed
int to unsigned int, allowing large value.

Fixes: 5a0d0a6161ae ("mlx4: Structures and init/teardown for VF resource quotas")
Signed-off-by: Aya Levin <ayal@...lanox.com>
Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/mellanox/mlx4/mlx4.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4.h b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
index 086920b615af..df5d86fa0a92 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
@@ -542,8 +542,8 @@ struct slave_list {
 struct resource_allocator {
 	spinlock_t alloc_lock; /* protect quotas */
 	union {
-		int res_reserved;
-		int res_port_rsvd[MLX4_MAX_PORTS];
+		unsigned int res_reserved;
+		unsigned int res_port_rsvd[MLX4_MAX_PORTS];
 	};
 	union {
 		int res_free;
-- 
2.19.1