From 8cf05a7841e1cfd894741d6bab43067b0ca85eb8 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Fri, 14 Jun 2019 15:41:09 -0700 Subject: [PATCH] md: raid10: Use struct_size() in kmalloc() One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; struct boo entry[]; }; instance = kmalloc(size, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kmalloc(struct_size(instance, entry, count), GFP_KERNEL); This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva Signed-off-by: Song Liu Signed-off-by: Jens Axboe --- drivers/md/raid10.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 1facd0153399..f35e076ee47d 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -4755,8 +4755,7 @@ static int handle_reshape_read_error(struct mddev *mddev, int idx = 0; struct page **pages; - r10b = kmalloc(sizeof(*r10b) + - sizeof(struct r10dev) * conf->copies, GFP_NOIO); + r10b = kmalloc(struct_size(r10b, devs, conf->copies), GFP_NOIO); if (!r10b) { set_bit(MD_RECOVERY_INTR, &mddev->recovery); return -ENOMEM;