From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 13 Apr 2021 10:50:04 +0000 (+0300)
Subject: Drivers: hv: vmbus: Use after free in __vmbus_open()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3e9bf43f7f7a46f21ec071cb47be92d0874c48da;p=linux.git

Drivers: hv: vmbus: Use after free in __vmbus_open()

The "open_info" variable is added to the &vmbus_connection.chn_msg_list,
but the error handling frees "open_info" without removing it from the
list.  This will result in a use after free.  First remove it from the
list, and then free it.

Fixes: 6f3d791f3006 ("Drivers: hv: vmbus: Fix rescind handling issues")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Andrea Parri <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/YHV3XLCot6xBS44r@mwanda
Signed-off-by: Wei Liu <wei.liu@kernel.org>
---

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index db30be8f9ccea..1c5a418c19628 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -653,7 +653,7 @@ static int __vmbus_open(struct vmbus_channel *newchannel,
 
 	if (newchannel->rescind) {
 		err = -ENODEV;
-		goto error_free_info;
+		goto error_clean_msglist;
 	}
 
 	err = vmbus_post_msg(open_msg,