netdev - [PATCH 1/1] net/mlx4: Fix build error use array_size() helper in copy_to

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Date:   Sat,  7 Jan 2023 15:27:25 +0800
From:   Yupeng Li <liyupeng@...los.com>
To:     tariqt@...dia.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yupeng Li <liyupeng@...los.com>,
        Caicai <caizp2008@....com>
Subject: [PATCH 1/1] net/mlx4: Fix build error use array_size() helper in copy_to_user()

When CONFIG_64BIT was disabled, check_copy_size() was declared with
attribute error: copy source size is too small, array_size() for 32BIT
was wrong size, some compiled msg with error like:

  CALL    scripts/checksyscalls.sh
  CC [M]  drivers/net/ethernet/mellanox/mlx4/cq.o
In file included from ./arch/x86/include/asm/preempt.h:7,
                 from ./include/linux/preempt.h:78,
                 from ./include/linux/percpu.h:6,
                 from ./include/linux/context_tracking_state.h:5,
                 from ./include/linux/hardirq.h:5,
                 from drivers/net/ethernet/mellanox/mlx4/cq.c:37:
In function ‘check_copy_size’,
    inlined from ‘copy_to_user’ at ./include/linux/uaccess.h:168:6,
    inlined from ‘mlx4_init_user_cqes’ at drivers/net/ethernet/mellanox/mlx4/cq.c:317:9,
    inlined from ‘mlx4_cq_alloc’ at drivers/net/ethernet/mellanox/mlx4/cq.c:394:10:
./include/linux/thread_info.h:228:4: error: call to ‘__bad_copy_from’ declared with attribute error: copy source size is too small
  228 |    __bad_copy_from();
      |    ^~~~~~~~~~~~~~~~~
make[6]: *** [scripts/Makefile.build:250：drivers/net/ethernet/mellanox/mlx4/cq.o] 错误 1
make[5]: *** [scripts/Makefile.build:500：drivers/net/ethernet/mellanox/mlx4] 错误 2
make[5]: *** 正在等待未完成的任务....
make[4]: *** [scripts/Makefile.build:500：drivers/net/ethernet/mellanox] 错误 2
make[3]: *** [scripts/Makefile.build:500：drivers/net/ethernet] 错误 2
make[3]: *** 正在等待未完成的任务....
make[2]: *** [scripts/Makefile.build:500：drivers/net] 错误 2
make[2]: *** 正在等待未完成的任务....
make[1]: *** [scripts/Makefile.build:500：drivers] 错误 2
make: *** [Makefile:1992：.] 错误 2

Signed-off-by: Yupeng Li <liyupeng@...los.com>
Reviewed-by: Caicai <caizp2008@....com>
---
 drivers/net/ethernet/mellanox/mlx4/cq.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/cq.c b/drivers/net/ethernet/mellanox/mlx4/cq.c
index 4d4f9cf9facb..7dadd7227480 100644
--- a/drivers/net/ethernet/mellanox/mlx4/cq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/cq.c
@@ -315,7 +315,11 @@ static int mlx4_init_user_cqes(void *buf, int entries, int cqe_size)
 		}
 	} else {
 		err = copy_to_user((void __user *)buf, init_ents,
+#ifdef CONFIG_64BIT
 				   array_size(entries, cqe_size)) ?
+#else
+				   entries * cqe_size) ?
+#endif
 			-EFAULT : 0;
 	}
 
-- 
2.25.1