diff options
| author | Lv Yunlong <lyl2019@mail.ustc.edu.cn> | 2021-03-30 18:59:59 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-31 14:26:56 -0700 |
| commit | bdc2ab5c61a5c07388f4820ff21e787b4dfd1ced (patch) | |
| tree | e4de98593b2567237161731b200b533b4de41f87 /net/rds | |
| parent | d47ec7a0a7271dda08932d6208e4ab65ab0c987c (diff) | |
net/rds: Fix a use after free in rds_message_map_pages
In rds_message_map_pages, the rm is freed by rds_message_put(rm).
But rm is still used by rm->data.op_sg in return value.
My patch assigns ERR_CAST(rm->data.op_sg) to err before the rm is
freed to avoid the uaf.
Fixes: 7dba92037baf3 ("net/rds: Use ERR_PTR for rds_message_alloc_sgs()")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
| -rw-r--r-- | net/rds/message.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/rds/message.c b/net/rds/message.c index 071a261fdaab..799034e0f513 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)) { + void *err = ERR_CAST(rm->data.op_sg); rds_message_put(rm); - return ERR_CAST(rm->data.op_sg); + return err; } for (i = 0; i < rm->data.op_nents; ++i) { |