blob: d299da375fcca2fd2cd2594bfbe8afd0b9418506 [file] [log] [blame]
From e9b439bf450a2e7c90ebbd3840839f275e7e4763 Mon Sep 17 00:00:00 2001
From: Bernard Metzler <bmt@zurich.ibm.com>
Date: Mon, 2 Mar 2020 19:16:14 +0100
Subject: [PATCH] RDMA/iwcm: Fix iwcm work deallocation
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@syzkaller.appspotmail.com
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/infiniband/core/iwcm.c b/drivers/infiniband/core/iwcm.c
index 72141c5b7c95..570dc526a942 100644
--- a/drivers/infiniband/core/iwcm.c
+++ b/drivers/infiniband/core/iwcm.c
@@ -159,8 +159,10 @@ static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
{
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)
--
2.7.4