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.
Reported-by: syzbot+cb0c054eabfba4342146@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Bernard Metzler <bmt@xxxxxxxxxxxxxx>
---
drivers/infiniband/core/iwcm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/iwcm.c b/drivers/infiniband/core/iwcm.c
index ade71823370f..da8adadf4755 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)
--
2.17.2
