diff options
| author |   Leon Romanovsky <leonro@mellanox.com> | 2020-02-12 09:26:35 +0200 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@mellanox.com> | 2020-02-13 10:39:23 -0400 |
| commit | 9b6d3bbc1335404b331f4f11dc896066bdf1c752 (patch) | |
| tree | 2dd5eb3eabf24c6a922a8649c6acf9e9e5410c26 /drivers | |
| parent | IB/umad: Fix kernel crash while unloading ib_umad (diff) | |
| download | linux-dev-9b6d3bbc1335404b331f4f11dc896066bdf1c752.tar.xz linux-dev-9b6d3bbc1335404b331f4f11dc896066bdf1c752.zip | |
RDMA/mlx5: Prevent overflow in mmap offset calculations
The cmd and index variables declared as u16 and the result is supposed to
be stored in u64. The C arithmetic rules doesn't promote "(index >> 8) <<
16" to be u64 and leaves the end result to be u16.
Fixes: 7be76bef320b ("IB/mlx5: Introduce VAR object and its alloc/destroy methods")
Link: https://lore.kernel.org/r/20200212072635.682689-10-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/main.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index e874d688d040..987bfdcd12a5 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -2283,8 +2283,8 @@ static int mlx5_ib_mmap_offset(struct mlx5_ib_dev *dev, static u64 mlx5_entry_to_mmap_offset(struct mlx5_user_mmap_entry *entry) { - u16 cmd = entry->rdma_entry.start_pgoff >> 16; - u16 index = entry->rdma_entry.start_pgoff & 0xFFFF; + u64 cmd = (entry->rdma_entry.start_pgoff >> 16) & 0xFFFF; + u64 index = entry->rdma_entry.start_pgoff & 0xFFFF; return (((index >> 8) << 16) | (cmd << MLX5_IB_MMAP_CMD_SHIFT) | (index & 0xFF)) << PAGE_SHIFT; |