Messages in this thread Patch in this message | | | Date | Tue, 8 Jan 2019 10:21:52 -0600 | From | "Gustavo A. R. Silva" <> | Subject | [PATCH] qxl: Use struct_size() in kzalloc() |
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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> --- drivers/gpu/drm/qxl/qxl_display.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c index ce0b9c40fc21..c8642712412e 100644 --- a/drivers/gpu/drm/qxl/qxl_display.c +++ b/drivers/gpu/drm/qxl/qxl_display.c @@ -48,8 +48,8 @@ static int qxl_alloc_client_monitors_config(struct qxl_device *qdev, } if (!qdev->client_monitors_config) { qdev->client_monitors_config = kzalloc( - sizeof(struct qxl_monitors_config) + - sizeof(struct qxl_head) * count, GFP_KERNEL); + struct_size(qdev->client_monitors_config, + heads, count), GFP_KERNEL); if (!qdev->client_monitors_config) return -ENOMEM; } -- 2.20.1
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