linux-kernel - [PATCH 4.18 013/235] net/mlx5: Fix not releasing read lock when adding flow rules

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Message-Id: <20180924113105.740944115@linuxfoundation.org>
Date:   Mon, 24 Sep 2018 13:49:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Roi Dayan <roid@...lanox.com>,
        Maor Gottlieb <maorg@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH 4.18 013/235] net/mlx5: Fix not releasing read lock when adding flow rules

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roi Dayan <roid@...lanox.com>

[ Upstream commit 071304772fc747d5df13c51f1cf48a4b922a5e0d ]

If building match list fg fails and we never jumped to
search_again_locked label then the function returned without
unlocking the read lock.

Fixes: bd71b08ec2ee ("net/mlx5: Support multiple updates of steering rules in parallel")
Signed-off-by: Roi Dayan <roid@...lanox.com>
Reviewed-by: Maor Gottlieb <maorg@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -1797,6 +1797,8 @@ search_again_locked:
 	if (err) {
 		if (take_write)
 			up_write_ref_node(&ft->node);
+		else
+			up_read_ref_node(&ft->node);
 		return ERR_PTR(err);
 	}