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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-13 16:56:48 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2020-02-13 17:09:47 -0800
commitcfb8d7811f815d17babadd87436300261fd54de7 (patch)
treed72162a09197955704b27fa00c88010ae89fe15c /drivers
parentInput: psmouse - switch to using i2c_new_scanned_device() (diff)
downloadlinux-dev-cfb8d7811f815d17babadd87436300261fd54de7.tar.xz
linux-dev-cfb8d7811f815d17babadd87436300261fd54de7.zip
Input: goldfish_events - replace zero-length array with flexible-array member
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. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Link: https://lore.kernel.org/r/20200213002430.GA31056@embeddedor.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/keyboard/goldfish_events.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/input/keyboard/goldfish_events.c b/drivers/input/keyboard/goldfish_events.c
index bc8c85a52a10..57d435fc5c73 100644
--- a/drivers/input/keyboard/goldfish_events.c
+++ b/drivers/input/keyboard/goldfish_events.c
@@ -30,7 +30,7 @@ struct event_dev {
struct input_dev *input;
int irq;
void __iomem *addr;
- char name[0];
+ char name[];
};
static irqreturn_t events_interrupt(int irq, void *dev_id)