Messages in this thread Patch in this message | | | Date | Mon, 5 Aug 2019 18:49:28 -0500 | From | "Gustavo A. R. Silva" <> | Subject | [PATCH] drm/msm: Use struct_size() helper |
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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 msm_gem_submit { ... struct { ... } bos[0]; };
Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes.
So, replace the following form:
sizeof(*submit) + ((u64)nr_bos * sizeof(submit->bos[0]))
with:
struct_size(submit, bos, nr_bos)
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> --- drivers/gpu/drm/msm/msm_gem_submit.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c index 348f8c2be806..7c17c6154058 100644 --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -26,8 +26,8 @@ static struct msm_gem_submit *submit_create(struct drm_device *dev, uint32_t nr_cmds) { struct msm_gem_submit *submit; - uint64_t sz = sizeof(*submit) + ((u64)nr_bos * sizeof(submit->bos[0])) + - ((u64)nr_cmds * sizeof(submit->cmd[0])); + uint64_t sz = struct_size(submit, bos, nr_bos) + + ((u64)nr_cmds * sizeof(submit->cmd[0])); if (sz > SIZE_MAX) return NULL; -- 2.22.0
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