diff options
| author | Maor Gottlieb <maorg@nvidia.com> | 2021-09-01 11:48:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-22 12:26:41 +0200 |
| commit | cd78d9c9968f5ed8c044794e6a2612332f11cd53 (patch) | |
| tree | 311d28da64fb1cb99dbfef516fcd4bd59b45ffb4 | |
| parent | 48e79555c22ce8aff3bdf2810dea1bd974a717c0 (diff) | |
net/mlx5: Fix potential sleeping in atomic context
commit ee27e330a953595903979ffdb84926843595a9fe 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: 693c6883bbc4 ("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>
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/fs_core.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c index 739bf5dc5a25..5fe4e028567a 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c @@ -1606,9 +1606,9 @@ static int build_match_list(struct match_list_head *match_head, curr_match = kmalloc(sizeof(*curr_match), GFP_ATOMIC); if (!curr_match) { + rcu_read_unlock(); free_match_list(match_head, ft_locked); - err = -ENOMEM; - goto out; + return -ENOMEM; } if (!tree_get_node(&g->node)) { kfree(curr_match); @@ -1617,7 +1617,6 @@ static int build_match_list(struct match_list_head *match_head, curr_match->g = g; list_add_tail(&curr_match->list, &match_head->list); } -out: rcu_read_unlock(); return err; } |