linux-kernel - [PATCH V2] drivers/firewire: use struct

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Message-Id: <20220210060805.1608198-1-chi.minghao@zte.com.cn>
Date:   Thu, 10 Feb 2022 06:08:05 +0000
From:   cgel.zte@...il.com
To:     stefanr@...6.in-berlin.de
Cc:     linux1394-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org,
        "Minghao Chi (CGEL ZTE)" <chi.minghao@....com.cn>
Subject: [PATCH V2] drivers/firewire: use struct_size over open coded arithmetic

From: "Minghao Chi (CGEL ZTE)" <chi.minghao@....com.cn>

Replace zero-length array with flexible-array member and make use
of the struct_size() helper in kmalloc(). For example:

struct fw_request {
    ...
    u32 data[];
}

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
---
 drivers/firewire/core-transaction.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index ac487c96bb71..563fdf8b2657 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -777,7 +777,7 @@ static struct fw_request *allocate_request(struct fw_card *card,
 		return NULL;
 	}
 
-	request = kmalloc(sizeof(*request) + length, GFP_ATOMIC);
+	request = kmalloc(struct_size(request, data, length), GFP_ATOMIC);
 	if (request == NULL)
 		return NULL;
 
-- 
2.25.1