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Message-Id: <20210311084616.12356-1-lyl2019@mail.ustc.edu.cn>
Date: Thu, 11 Mar 2021 00:46:16 -0800
From: Lv Yunlong <lyl2019@...l.ustc.edu.cn>
To: santosh.shilimkar@...cle.com, davem@...emloft.net, kuba@...nel.org
Cc: netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
rds-devel@....oracle.com, linux-kernel@...r.kernel.org,
Lv Yunlong <lyl2019@...l.ustc.edu.cn>
Subject: [PATCH] net/rds: Fix a use after free in rds_message_map_pages
In rds_message_map_pages, rds_message_put() will free rm.
Maybe store the value of rm->data.op_sg ahead of rds_message_put()
is better. Otherwise other threads could allocate the freed chunk
and may change the value of rm->data.op_sg.
Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>
---
net/rds/message.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/rds/message.c b/net/rds/message.c
index 071a261fdaab..392e3a2f41a0 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -347,8 +347,9 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
rm->data.op_nents = DIV_ROUND_UP(total_len, PAGE_SIZE);
rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
if (IS_ERR(rm->data.op_sg)) {
+ struct scatterlist *tmp = rm->data.op_sg;
rds_message_put(rm);
- return ERR_CAST(rm->data.op_sg);
+ return ERR_CAST(tmp);
}
for (i = 0; i < rm->data.op_nents; ++i) {
--
2.25.1
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