linux-kernel - [PATCH 02/10] tty: tty_buffer: use struct_size() in tty_buffer

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Date:   Wed, 16 Aug 2023 12:55:22 +0200
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Subject: [PATCH 02/10] tty: tty_buffer: use struct_size() in tty_buffer_alloc()

Now, that tty_buffer::data has the right type, use struct_size() for
size calculation. struct_size() makes the code less error-prone and more
readable.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 drivers/tty/tty_buffer.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 684d099cbe11..c94df1a2d7f8 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -177,8 +177,7 @@ static struct tty_buffer *tty_buffer_alloc(struct tty_port *port, size_t size)
 	 */
 	if (atomic_read(&port->buf.mem_used) > port->buf.mem_limit)
 		return NULL;
-	p = kmalloc(sizeof(struct tty_buffer) + 2 * size,
-		    GFP_ATOMIC | __GFP_NOWARN);
+	p = kmalloc(struct_size(p, data, 2 * size), GFP_ATOMIC | __GFP_NOWARN);
 	if (p == NULL)
 		return NULL;
 
-- 
2.41.0