diff options
| author | Yixing Liu <liuyixing1@huawei.com> | 2022-10-24 16:38:14 +0800 |
|---|---|---|
| committer | Leon Romanovsky <leon@kernel.org> | 2022-10-24 15:01:57 +0300 |
| commit | 12bcaf87d8b66d8cd812479c8a6349dcb245375c (patch) | |
| tree | 6c579d90c627c4c225df5635009e423e9cb6e148 /drivers/infiniband | |
| parent | 9e272ed69ad6f6952fafd0599d6993575512408e (diff) | |
| download | lwn-12bcaf87d8b66d8cd812479c8a6349dcb245375c.tar.gz lwn-12bcaf87d8b66d8cd812479c8a6349dcb245375c.zip | |
RDMA/hns: Fix NULL pointer problem in free_mr_init()
Lock grab occurs in a concurrent scenario, resulting in stepping on a NULL
pointer. It should be init mutex_init() first before use the lock.
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Call trace:
__mutex_lock.constprop.0+0xd0/0x5c0
__mutex_lock_slowpath+0x1c/0x2c
mutex_lock+0x44/0x50
free_mr_send_cmd_to_hw+0x7c/0x1c0 [hns_roce_hw_v2]
hns_roce_v2_dereg_mr+0x30/0x40 [hns_roce_hw_v2]
hns_roce_dereg_mr+0x4c/0x130 [hns_roce_hw_v2]
ib_dereg_mr_user+0x54/0x124
uverbs_free_mr+0x24/0x30
destroy_hw_idr_uobject+0x38/0x74
uverbs_destroy_uobject+0x48/0x1c4
uobj_destroy+0x74/0xcc
ib_uverbs_cmd_verbs+0x368/0xbb0
ib_uverbs_ioctl+0xec/0x1a4
__arm64_sys_ioctl+0xb4/0x100
invoke_syscall+0x50/0x120
el0_svc_common.constprop.0+0x58/0x190
do_el0_svc+0x30/0x90
el0_svc+0x2c/0xb4
el0t_64_sync_handler+0x1a4/0x1b0
el0t_64_sync+0x19c/0x1a0
Fixes: 70f92521584f ("RDMA/hns: Use the reserved loopback QPs to free MR before destroying MPT")
Signed-off-by: Yixing Liu <liuyixing1@huawei.com>
Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Link: https://lore.kernel.org/r/20221024083814.1089722-3-xuhaoyue1@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c index 7f5a4769cee0..1435fe2ea176 100644 --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c @@ -2801,8 +2801,12 @@ static int free_mr_modify_qp(struct hns_roce_dev *hr_dev) static int free_mr_init(struct hns_roce_dev *hr_dev) { + struct hns_roce_v2_priv *priv = hr_dev->priv; + struct hns_roce_v2_free_mr *free_mr = &priv->free_mr; int ret; + mutex_init(&free_mr->mutex); + ret = free_mr_alloc_res(hr_dev); if (ret) return ret; |