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Date:   Wed, 8 Jan 2020 08:42:36 +0300
From:   Dan Carpenter <>
To:     "David S. Miller" <>
Cc:     Michal Kubecek <>,
        Florian Fainelli <>,,
Subject: [PATCH] ethtool: potential NULL dereference in strset_prepare_data()

Smatch complains that the NULL checking isn't done consistently:

    net/ethtool/strset.c:253 strset_prepare_data()
    error: we previously assumed 'dev' could be null (see line 233)

It looks like there is a missing return on this path.

Fixes: 71921690f974 ("ethtool: provide string sets with STRSET_GET request")
Signed-off-by: Dan Carpenter <>
 net/ethtool/strset.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ethtool/strset.c b/net/ethtool/strset.c
index 9f2243329015..82a059c13c1c 100644
--- a/net/ethtool/strset.c
+++ b/net/ethtool/strset.c
@@ -239,6 +239,7 @@ static int strset_prepare_data(const struct ethnl_req_info *req_base,
 				return -EINVAL;
+		return 0;
 	ret = ethnl_ops_begin(dev);

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