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net/switchdev: use struct_size over open coded arithmetic

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

struct switchdev_deferred_item {
    ...
    unsigned long data[];
};

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

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@zte.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Minghao Chi (CGEL ZTE) 2022-02-10 06:10:08 +00:00 committed by David S. Miller
parent dc513a405c
commit d8c2858181
1 changed files with 1 additions and 1 deletions
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net/switchdev/switchdev.c
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@ -85,7 +85,7 @@ static int switchdev_deferred_enqueue(struct net_device *dev,
{
struct switchdev_deferred_item *dfitem;
dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC);
dfitem = kmalloc(struct_size(dfitem, data, data_len), GFP_ATOMIC);
if (!dfitem)
return -ENOMEM;
dfitem->dev = dev;