linux-kernel - [PATCH 10/11] IB/mlx5: Fix undefined behavior due to shift overflowing the constant

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Date:   Tue,  5 Apr 2022 17:15:16 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Leon Romanovsky <leon@...nel.org>,
        Saeed Mahameed <saeedm@...dia.com>, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH 10/11] IB/mlx5: Fix undefined behavior due to shift overflowing the constant

From: Borislav Petkov <bp@...e.de>

Fix:

  drivers/infiniband/hw/mlx5/main.c: In function ‘translate_eth_legacy_proto_oper’:
  drivers/infiniband/hw/mlx5/main.c:370:2: error: case label does not reduce to an integer constant
    case MLX5E_PROT_MASK(MLX5E_50GBASE_KR2):
    ^~~~

See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory
details as to why it triggers with older gccs only.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Leon Romanovsky <leon@...nel.org>
Cc: Saeed Mahameed <saeedm@...dia.com>
Cc: linux-rdma@...r.kernel.org
Cc: netdev@...r.kernel.org
---
 include/linux/mlx5/port.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mlx5/port.h b/include/linux/mlx5/port.h
index 28a928b0684b..e96ee1e348cb 100644
--- a/include/linux/mlx5/port.h
+++ b/include/linux/mlx5/port.h
@@ -141,7 +141,7 @@ enum mlx5_ptys_width {
 	MLX5_PTYS_WIDTH_12X	= 1 << 4,
 };
 
-#define MLX5E_PROT_MASK(link_mode) (1 << link_mode)
+#define MLX5E_PROT_MASK(link_mode) (1U << link_mode)
 #define MLX5_GET_ETH_PROTO(reg, out, ext, field)	\
 	(ext ? MLX5_GET(reg, out, ext_##field) :	\
 	MLX5_GET(reg, out, field))
-- 
2.35.1