linux-kernel - [PATCH] rpmsg: char: fix resource leak on kbuf on copy_from_iter

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Date:   Tue,  8 Oct 2019 13:00:18 +0100
From:   Colin King <colin.king@...onical.com>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-remoteproc@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rpmsg: char: fix resource leak on kbuf on copy_from_iter_full failure

From: Colin Ian King <colin.king@...onical.com>

Currently when copy_from_iter_full fails the kbuf is not free'd on the
error return path. Fix this by setting the error return code and exiting
via the free_kbuf path.

Addresses-Coverity: ("Resource leak")
Fixes: ccf45b18ce89 ("rpmsg: char: Migrate to iter versions of read and write")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/rpmsg/rpmsg_char.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 507bfe163883..7db28643db43 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -227,8 +227,10 @@ static ssize_t rpmsg_eptdev_write_iter(struct kiocb *iocb,
 	if (!kbuf)
 		return -ENOMEM;
 
-	if (!copy_from_iter_full(kbuf, len, from))
-		return -EFAULT;
+	if (!copy_from_iter_full(kbuf, len, from)) {
+		ret = -EFAULT;
+		goto free_kbuf;
+	}
 
 	if (mutex_lock_interruptible(&eptdev->ept_lock)) {
 		ret = -ERESTARTSYS;
-- 
2.20.1