linux-hardening - [PATCH][next] bcachefs: Use array_size() in call to copy_from

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Message-ID: <ZYDjMgyrFYhOsazc@work>
Date: Mon, 18 Dec 2023 18:26:26 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Kent Overstreet <kent.overstreet@...ux.dev>,
	Brian Foster <bfoster@...hat.com>
Cc: linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] bcachefs: Use array_size() in call to copy_from_user()

Use array_size() helper, instead of the open-coded version in
call to copy_from_user().

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 fs/bcachefs/chardev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/bcachefs/chardev.c b/fs/bcachefs/chardev.c
index 304ea619a888..22a52bc8406b 100644
--- a/fs/bcachefs/chardev.c
+++ b/fs/bcachefs/chardev.c
@@ -360,7 +360,8 @@ static long bch2_ioctl_fsck_offline(struct bch_ioctl_fsck_offline __user *user_a
 	init_waitqueue_head(&thr->output.wait);
 	darray_init(&thr->output2);
 
-	if (copy_from_user(devs, &user_arg->devs[0], sizeof(user_arg->devs[0]) * arg.nr_devs)) {
+	if (copy_from_user(devs, &user_arg->devs[0],
+			   array_size(sizeof(user_arg->devs[0]), arg.nr_devs))) {
 		ret = -EINVAL;
 		goto err;
 	}
-- 
2.34.1