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authorGustavo A. R. Silva <gustavo@embeddedor.com>2019-01-08 19:02:33 +0300
committerMike Snitzer <snitzer@redhat.com>2019-03-05 22:48:51 +0300
commitd2832376b69e1e02cae0de660ab7c03223f09341 (patch)
tree51572277eb740ea06883befe58fa939348a7bfe1 /drivers/md
parente689fbab3ddd92557134ef92c40a780a33299d05 (diff)
downloadlinux-d2832376b69e1e02cae0de660ab7c03223f09341.tar.xz
dm switch: use struct_size() in kzalloc()
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; void *entry[]; }; instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(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: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-switch.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c
index fae35caf3672..8a0f057b8122 100644
--- a/drivers/md/dm-switch.c
+++ b/drivers/md/dm-switch.c
@@ -61,8 +61,7 @@ static struct switch_ctx *alloc_switch_ctx(struct dm_target *ti, unsigned nr_pat
{
struct switch_ctx *sctx;
- sctx = kzalloc(sizeof(struct switch_ctx) + nr_paths * sizeof(struct switch_path),
- GFP_KERNEL);
+ sctx = kzalloc(struct_size(sctx, path_list, nr_paths), GFP_KERNEL);
if (!sctx)
return NULL;