[rds-devel] [PATCHv2 1/1] net: rds: add service level support in rds-info
Zhu Yanjun
yanjun.zhu at oracle.com
Tue Sep 3 22:08:51 PDT 2019
On 2019/9/3 9:58, Gustavo A. R. Silva wrote:
> Hi,
>
> On 8/23/19 8:04 PM, Zhu Yanjun wrote:
>
> [..]
>
>> diff --git a/net/rds/ib.c b/net/rds/ib.c
>> index ec05d91..45acab2 100644
>> --- a/net/rds/ib.c
>> +++ b/net/rds/ib.c
>> @@ -291,7 +291,7 @@ static int rds_ib_conn_info_visitor(struct rds_connection *conn,
>> void *buffer)
>> {
>> struct rds_info_rdma_connection *iinfo = buffer;
>> - struct rds_ib_connection *ic;
>> + struct rds_ib_connection *ic = conn->c_transport_data;
>>
>> /* We will only ever look at IB transports */
>> if (conn->c_trans != &rds_ib_transport)
>> @@ -301,15 +301,16 @@ static int rds_ib_conn_info_visitor(struct rds_connection *conn,
>>
>> iinfo->src_addr = conn->c_laddr.s6_addr32[3];
>> iinfo->dst_addr = conn->c_faddr.s6_addr32[3];
>> - iinfo->tos = conn->c_tos;
>> + if (ic) {
> Is this null-check actually necessary? (see related comments below...)
>
>> + iinfo->tos = conn->c_tos;
>> + iinfo->sl = ic->i_sl;
>> + }
>>
>> memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
>> memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
>> if (rds_conn_state(conn) == RDS_CONN_UP) {
>> struct rds_ib_device *rds_ibdev;
>>
>> - ic = conn->c_transport_data;
>> -
>> rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid,
> Notice that *ic* is dereferenced here without null-checking it. More
> comments below...
>
>> (union ib_gid *)&iinfo->dst_gid);
>>
>> @@ -329,7 +330,7 @@ static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
>> void *buffer)
>> {
>> struct rds6_info_rdma_connection *iinfo6 = buffer;
>> - struct rds_ib_connection *ic;
>> + struct rds_ib_connection *ic = conn->c_transport_data;
>>
>> /* We will only ever look at IB transports */
>> if (conn->c_trans != &rds_ib_transport)
>> @@ -337,6 +338,10 @@ static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
>>
>> iinfo6->src_addr = conn->c_laddr;
>> iinfo6->dst_addr = conn->c_faddr;
>> + if (ic) {
>> + iinfo6->tos = conn->c_tos;
>> + iinfo6->sl = ic->i_sl;
>> + }
>>
>> memset(&iinfo6->src_gid, 0, sizeof(iinfo6->src_gid));
>> memset(&iinfo6->dst_gid, 0, sizeof(iinfo6->dst_gid));
>> @@ -344,7 +349,6 @@ static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
>> if (rds_conn_state(conn) == RDS_CONN_UP) {
>> struct rds_ib_device *rds_ibdev;
>>
>> - ic = conn->c_transport_data;
>> rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid,
> Again, *ic* is being dereferenced here without a previous null-check.
Please check when this "rds_conn_state(conn) = RDS_CONN_UP".
Thanks a lot.
Zhu Yanjun
>
>> (union ib_gid *)&iinfo6->dst_gid);
>> rds_ibdev = ic->rds_ibdev;
>
> --
> Gustavo
>
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