From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Ohad Ben-Cohen <ohad@wizery.com>,
Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] remoteproc: use struct_size() helper
Date: Fri, 30 Aug 2019 10:14:06 -0500 [thread overview]
Message-ID: <20190830151406.GA23274@embeddedor> (raw)
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 fw_rsc_vdev {
...
struct fw_rsc_vdev_vring vring[0];
} __packed;
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(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
with:
struct_size(rsc, vring, rsc->num_of_vrings)
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/remoteproc/remoteproc_core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 3c5fbbbfb0f1..d427b8208ad6 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -478,8 +478,8 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
char name[16];
/* make sure resource isn't truncated */
- if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
- + rsc->config_len > avail) {
+ if (struct_size(rsc, vring, rsc->num_of_vrings) + rsc->config_len >
+ avail) {
dev_err(dev, "vdev rsc is truncated\n");
return -EINVAL;
}
--
2.23.0
next reply other threads:[~2019-08-30 15:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-30 15:14 Gustavo A. R. Silva [this message]
-- strict thread matches above, loose matches on Subject: below --
2019-06-07 18:53 [PATCH] remoteproc: Use struct_size() helper Gustavo A. R. Silva
2019-06-29 19:04 ` Bjorn Andersson
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