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net/mlx5: Fix potential sleeping in atomic context

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commit ee27e330a9 upstream.

Fixes the below flow of sleeping in atomic context by releasing
the RCU lock before calling to free_match_list.

build_match_list() <- disables preempt
-> free_match_list()
   -> tree_put_node()
      -> down_write_ref_node() <- take write lock

Fixes: 693c6883bb ("net/mlx5: Add hash table for flow groups in flow table")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maor Gottlieb 2021-09-01 11:48:13 +03:00 committed by Greg Kroah-Hartman
parent 29a5af9112
commit c586bc31d5
1 changed files with 2 additions and 3 deletions
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5
drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
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@ -1675,14 +1675,13 @@ static int build_match_list(struct match_list *match_head,
curr_match = kmalloc(sizeof(*curr_match), GFP_ATOMIC); curr_match = kmalloc(sizeof(*curr_match), GFP_ATOMIC);
if (!curr_match) { if (!curr_match) {
rcu_read_unlock();
free_match_list(match_head, ft_locked); free_match_list(match_head, ft_locked);
err = -ENOMEM; return -ENOMEM;
goto out;
} }
curr_match->g = g; curr_match->g = g;
list_add_tail(&curr_match->list, &match_head->list); list_add_tail(&curr_match->list, &match_head->list);
} }
out:
rcu_read_unlock(); rcu_read_unlock();
return err; return err;
} }