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 code of the following form:
sizeof(*w) + sizeof(struct sof_ipc_window_elem) * w->num_windows
with:
struct_size(w, window, w->num_windows)
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 <gustavo@xxxxxxxxxxxxxx>
---
sound/soc/sof/loader.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/sound/soc/sof/loader.c b/sound/soc/sof/loader.c
index 628fae552442..16b016b76fd8 100644
--- a/sound/soc/sof/loader.c
+++ b/sound/soc/sof/loader.c
@@ -19,15 +19,13 @@ static int get_ext_windows(struct snd_sof_dev *sdev,
{
struct sof_ipc_window *w =
container_of(ext_hdr, struct sof_ipc_window, ext_hdr);
- size_t size;
if (w->num_windows == 0 || w->num_windows > SOF_IPC_MAX_ELEMS)
return -EINVAL;
- size = sizeof(*w) + sizeof(struct sof_ipc_window_elem) * w->num_windows;
-
/* keep a local copy of the data */
- sdev->info_window = kmemdup(w, size, GFP_KERNEL);
+ sdev->info_window = kmemdup(w, struct_size(w, window, w->num_windows),
+ GFP_KERNEL);
if (!sdev->info_window)
return -ENOMEM;
--
2.21.0
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