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authorGustavo A. R. Silva <gustavo@embeddedor.com>2019-06-14 15:41:09 -0700
committerJens Axboe <axboe@kernel.dk>2019-06-15 01:37:34 -0600
commit8cf05a7841e1cfd894741d6bab43067b0ca85eb8 (patch)
tree047fc925c7b01ad0249ab13e5f5cdb23127a20ce
parentebfeb444fa6fd9bc7be62694fff838bc57e19a7d (diff)
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 <gustavo@embeddedor.com> Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--drivers/md/raid10.c3
1 files changed, 1 insertions, 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;