netdev - [PATCH net-next 6/7] devlink: Fix use-after-free at reporter destroy

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Message-Id: <1548172644-30862-7-git-send-email-eranbe@mellanox.com>
Date:   Tue, 22 Jan 2019 17:57:23 +0200
From:   Eran Ben Elisha <eranbe@...lanox.com>
To:     netdev@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Saeed Mahameed <saeedm@...lanox.com>
Cc:     Moshe Shemesh <moshe@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>
Subject: [PATCH net-next 6/7] devlink: Fix use-after-free at reporter destroy

Fix a bug where reporter->devlink attribute was used after the reporter
was freed.

Fixes: 880ee82f0313 ("devlink: Add health reporter create/destroy functionality")
Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
Reviewed-by: Moshe Shemesh <moshe@...lanox.com>
---
 net/core/devlink.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 379ebd3f9a59..3cb74694de86 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4150,12 +4150,14 @@ EXPORT_SYMBOL_GPL(devlink_health_reporter_create);
 void
 devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
 {
-	mutex_lock(&reporter->devlink->lock);
+	struct devlink *devlink = reporter->devlink;
+
+	mutex_lock(&devlink->lock);
 	list_del(&reporter->list);
 	if (reporter->dump_msg_ctx)
 		devlink_msg_ctx_free(reporter->dump_msg_ctx);
 	kfree(reporter);
-	mutex_unlock(&reporter->devlink->lock);
+	mutex_unlock(&devlink->lock);
 }
 EXPORT_SYMBOL_GPL(devlink_health_reporter_destroy);
 
-- 
2.17.1