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net/mlx4: Fix UBSAN warning of signed integer overflow 

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: 5a0d0a6161 ("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>
This commit is contained in:
Aya Levin 2018-11-15 18:05:15 +02:00 committed by David S. Miller
parent 3ea7e7ea53
commit a463146e67
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/mellanox/mlx4/mlx4.h
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@ -540,8 +540,8 @@ 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;