Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes, in particular in the context in which this code is being used.
So, replace the following form: sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]) with: struct_size(new_ptbl, part, target) Also, notice that variable size is unnecessary, hence it is removed. This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <[email protected]> --- block/genhd.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index ad6826628e79..c674d9090f40 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1281,7 +1281,6 @@ int disk_expand_part_tbl(struct gendisk *disk, int partno) struct disk_part_tbl *new_ptbl; int len = old_ptbl ? old_ptbl->len : 0; int i, target; - size_t size; /* * check for int overflow, since we can get here from blkpg_ioctl() @@ -1298,8 +1297,8 @@ int disk_expand_part_tbl(struct gendisk *disk, int partno) if (target <= len) return 0; - size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]); - new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id); + new_ptbl = kzalloc_node(struct_size(new_ptbl, part, target), GFP_KERNEL, + disk->node_id); if (!new_ptbl) return -ENOMEM; -- 2.21.0
