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    Subject[PATCH AUTOSEL 4.9 13/18] net/mlx4: Fix UBSAN warning of signed integer overflow
    Date
    From: Aya Levin <ayal@mellanox.com>

    [ 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@mellanox.com>
    Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <sashal@kernel.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;
    --
    2.17.1
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