linux-kernel - [PATCH 4.4 65/72] RDMA/iwcm: Fix iwcm work deallocation

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Message-Id: <20200310123617.779350871@linuxfoundation.org>
Date:   Tue, 10 Mar 2020 13:39:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+cb0c054eabfba4342146@...kaller.appspotmail.com,
        Bernard Metzler <bmt@...ich.ibm.com>,
        Jason Gunthorpe <jgg@...lanox.com>
Subject: [PATCH 4.4 65/72] RDMA/iwcm: Fix iwcm work deallocation

From: Bernard Metzler <bmt@...ich.ibm.com>

commit 810dbc69087b08fd53e1cdd6c709f385bc2921ad upstream.

The dealloc_work_entries() function must update the work_free_list pointer
while freeing its entries, since potentially called again on same list. A
second iteration of the work list caused system crash. This happens, if
work allocation fails during cma_iw_listen() and free_cm_id() tries to
free the list again during cleanup.

Fixes: 922a8e9fb2e0 ("RDMA: iWARP Connection Manager.")
Link: https://lore.kernel.org/r/20200302181614.17042-1-bmt@zurich.ibm.com
Reported-by: syzbot+cb0c054eabfba4342146@...kaller.appspotmail.com
Signed-off-by: Bernard Metzler <bmt@...ich.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/core/iwcm.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/core/iwcm.c
+++ b/drivers/infiniband/core/iwcm.c
@@ -125,8 +125,10 @@ static void dealloc_work_entries(struct
 {
 	struct list_head *e, *tmp;
 
-	list_for_each_safe(e, tmp, &cm_id_priv->work_free_list)
+	list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) {
+		list_del(e);
 		kfree(list_entry(e, struct iwcm_work, free_list));
+	}
 }
 
 static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)