linux-kernel - [PATCH] i3c: master: fix a memory leak bug

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Date:   Sun, 11 Aug 2019 13:33:06 -0500
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Boris Brezillon <bbrezillon@...nel.org>,
        linux-i3c@...ts.infradead.org (open list:I3C SUBSYSTEM),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] i3c: master: fix a memory leak bug

In i3c_master_getmwl_locked(), the buffer used for the dest payload data is
allocated using kzalloc() in i3c_ccc_cmd_dest_init(). Later on, the length
of the dest payload data is checked against 'sizeof(*mwl)'. If they are not
equal, -EIO is returned to indicate the error. However, the allocated
buffer is not deallocated on this path, leading to a memory leak.

To fix the above issue, free the buffer before returning the error.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 drivers/i3c/master.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index d6f8b03..562f69f 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1084,8 +1084,10 @@ static int i3c_master_getmwl_locked(struct i3c_master_controller *master,
 	if (ret)
 		goto out;

-	if (dest.payload.len != sizeof(*mwl))
-		return -EIO;
+	if (dest.payload.len != sizeof(*mwl)) {
+		ret = -EIO;
+		goto out;
+	}

 	info->max_write_len = be16_to_cpu(mwl->len);

-- 
2.7.4