linux-kernel - [PATCH 3.16 116/370] target/iscsi: Fix double free in lio_target_tiqn

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Date:   Fri, 10 Mar 2017 11:46:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Bart Van Assche" <bart.vanassche@...disk.com>,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        "David Disseldorp" <ddiss@...e.de>
Subject: [PATCH 3.16 116/370] target/iscsi: Fix double free in
 lio_target_tiqn_addtpg()

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit a91918cd3ea11f91c68e08e1e8ce1b560447a80e upstream.

This iscsit_tpg_add_portal_group() function is only called from
lio_target_tiqn_addtpg().  Both functions free the "tpg" pointer on
error so it's a double free bug.  The memory is allocated in the caller
so it should be freed in the caller and not here.

Fixes: e48354ce078c ("iscsi-target: Add iSCSI fabric support for target v4.1")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: David Disseldorp <ddiss@...e.de>
[ bvanassche: Added "Fix" at start of patch title ]
Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/target/iscsi/iscsi_target_tpg.c | 1 -
 1 file changed, 1 deletion(-)

--- a/drivers/target/iscsi/iscsi_target_tpg.c
+++ b/drivers/target/iscsi/iscsi_target_tpg.c
@@ -261,7 +261,6 @@ err_out:
 		iscsi_release_param_list(tpg->param_list);
 		tpg->param_list = NULL;
 	}
-	kfree(tpg);
 	return -ENOMEM;
 }