linux-kernel - [char-misc for v5.0] mei: free read cb on ctrl

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Message-Id: <20190130081226.14315-1-tomas.winkler@intel.com>
Date:   Wed, 30 Jan 2019 10:12:26 +0200
From:   Tomas Winkler <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org,
        Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc for v5.0] mei: free read cb on ctrl_wr list flush

From: Alexander Usyskin <alexander.usyskin@...el.com>

There is a little window during disconnection flow
when read cb is moved between lists and may be not freed.
Remove moving read cbs explicitly during flash fixes this memory
leak.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/client.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 1fc8ea0f519b..ca4c9cc218a2 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -401,8 +401,11 @@ static void mei_io_list_flush_cl(struct list_head *head,
 	struct mei_cl_cb *cb, *next;
 
 	list_for_each_entry_safe(cb, next, head, list) {
-		if (cl == cb->cl)
+		if (cl == cb->cl) {
 			list_del_init(&cb->list);
+			if (cb->fop_type == MEI_FOP_READ)
+				mei_io_cb_free(cb);
+		}
 	}
 }
 
-- 
2.20.1