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From: "Gustavo A. R. Silva" <>
To: Dmitry Torokhov <>
	"Gustavo A. R. Silva" <>
Subject: [PATCH] Input: tca6416-keypad - replace zero-length array with flexible-array member
Date: Fri, 14 Feb 2020 11:20:22 -0600
Message-ID: <20200214172022.GA27490@embeddedor> (raw)

The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <>
 drivers/input/keyboard/tca6416-keypad.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/keyboard/tca6416-keypad.c b/drivers/input/keyboard/tca6416-keypad.c
index 2a14769de637..21758767ccf0 100644
--- a/drivers/input/keyboard/tca6416-keypad.c
+++ b/drivers/input/keyboard/tca6416-keypad.c
@@ -33,7 +33,7 @@ MODULE_DEVICE_TABLE(i2c, tca6416_id);
 struct tca6416_drv_data {
 	struct input_dev *input;
-	struct tca6416_button data[0];
+	struct tca6416_button data[];
 struct tca6416_keypad_chip {
@@ -48,7 +48,7 @@ struct tca6416_keypad_chip {
 	int irqnum;
 	u16 pinmask;
 	bool use_polling;
-	struct tca6416_button buttons[0];
+	struct tca6416_button buttons[];
 static int tca6416_write_reg(struct tca6416_keypad_chip *chip, int reg, u16 val)

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14 17:20 Gustavo A. R. Silva [this message]
2020-02-15 23:30 ` Dmitry Torokhov

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