From: Nathan Chancellor <natechancellor@gmail.com>
To: Saeed Mahameed <saeedm@mellanox.com>, Leon Romanovsky <leon@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>,
Boris Pismenny <borisp@mellanox.com>,
netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH] net/mlx5e: Return in default case statement in tx_post_resync_params
Date: Mon, 8 Jul 2019 16:11:55 -0700 [thread overview]
Message-ID: <20190708231154.89969-1-natechancellor@gmail.com> (raw)
clang warns:
drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c:251:2:
warning: variable 'rec_seq_sz' is used uninitialized whenever switch
default is taken [-Wsometimes-uninitialized]
default:
^~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c:255:46: note:
uninitialized use occurs here
skip_static_post = !memcmp(rec_seq, &rn_be, rec_seq_sz);
^~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c:239:16: note:
initialize the variable 'rec_seq_sz' to silence this warning
u16 rec_seq_sz;
^
= 0
1 warning generated.
This case statement was clearly designed to be one that should not be
hit during runtime because of the WARN_ON statement so just return early
to prevent copying uninitialized memory up into rn_be.
Fixes: d2ead1f360e8 ("net/mlx5e: Add kTLS TX HW offload support")
Link: https://github.com/ClangBuiltLinux/linux/issues/590
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
index 3f5f4317a22b..5c08891806f0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
@@ -250,6 +250,7 @@ tx_post_resync_params(struct mlx5e_txqsq *sq,
}
default:
WARN_ON(1);
+ return;
}
skip_static_post = !memcmp(rec_seq, &rn_be, rec_seq_sz);
--
2.22.0
next reply other threads:[~2019-07-08 23:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-08 23:11 Nathan Chancellor [this message]
2019-07-09 22:44 ` [PATCH] net/mlx5e: Return in default case statement in tx_post_resync_params Nick Desaulniers
2019-07-09 23:10 ` Nathan Chancellor
2019-07-10 4:24 ` Leon Romanovsky
2019-07-10 4:47 ` [PATCH v2] net/mlx5e: Refactor switch statements to avoid using uninitialized variables Nathan Chancellor
2019-07-10 5:22 ` Leon Romanovsky
2019-07-10 5:36 ` David Miller
2019-07-10 5:57 ` Nathan Chancellor
2019-07-10 6:06 ` [PATCH net-next v3] net/mlx5e: Convert single case statement switch statements into if statements Nathan Chancellor
2019-07-10 9:31 ` Leon Romanovsky
2019-07-12 18:37 ` David Miller
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