[PATCH][next] block: bio: Use struct_size() in kmalloc()

[Gustavo A. R. Silva]

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

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
Signed-off-by: Gustavo A. R. Silva <gustavo...@kernel.org>
---
 block/bio.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index a7366c02c9b5..fb5533416fa6 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -444,9 +444,7 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned int 
nr_iovecs,
                if (nr_iovecs > UIO_MAXIOV)
                        return NULL;
 
-               p = kmalloc(sizeof(struct bio) +
-                           nr_iovecs * sizeof(struct bio_vec),
-                           gfp_mask);
+               p = kmalloc(struct_size(bio, bi_inline_vecs, nr_iovecs), 
gfp_mask);
                front_pad = 0;
                inline_vecs = nr_iovecs;
        } else {
-- 
2.27.0