RDMA/erdma: Prevent use-after-free in erdma_accept_newconn()

[ Upstream commit 83437689249e6a17b25e27712fbee292e42e7855 ]

After the erdma_cep_put(new_cep) being called, new_cep will be freed,
and the following dereference will cause a UAF problem. Fix this issue.

Fixes: 920d93eac8b9 ("RDMA/erdma: Add connection management (CM) support")
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/hw/erdma/erdma_cm.c b/drivers/infiniband/hw/erdma/erdma_cm.c
index 771059a8eb7d7f76eb38652edbce9bfdb5ee89b3..e349e8d2fb50a8383131ab289b2eabf1a8c920f2 100644 (file)
--- a/drivers/infiniband/hw/erdma/erdma_cm.c
+++ b/drivers/infiniband/hw/erdma/erdma_cm.c
@@ -705,7 +705,6 @@ error:
                erdma_cancel_mpatimer(new_cep);
 
                erdma_cep_put(new_cep);
-               new_cep->sock = NULL;
        }
 
        if (new_s) {