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RDMA/rtrs-srv: Do not pass a valid pointer to PTR_ERR()

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smatch gives the warning:

  drivers/infiniband/ulp/rtrs/rtrs-srv.c:1805 rtrs_rdma_connect() warn: passing zero to 'PTR_ERR'

Which is trying to say smatch has shown that srv is not an error pointer
and thus cannot be passed to PTR_ERR.

The solution is to move the list_add() down after full initilization of
rtrs_srv. To avoid holding the srv_mutex too long, only hold it during the
list operation as suggested by Leon.

Fixes: 03e9b33a0f ("RDMA/rtrs: Only allow addition of path to an already established session")
Link: https://lore.kernel.org/r/20210216143807.65923-1-jinpu.wang@cloud.ionos.com
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jack Wang 2021-02-16 15:38:07 +01:00 committed by Jason Gunthorpe
parent 2b5715fc17
commit ed40852967
1 changed files with 7 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/infiniband/ulp/rtrs/rtrs-srv.c
View File

@ -1347,21 +1347,18 @@ static struct rtrs_srv *get_or_create_srv(struct rtrs_srv_ctx *ctx,
return srv;
}
}
mutex_unlock(&ctx->srv_mutex);
/*
* If this request is not the first connection request from the
* client for this session then fail and return error.
*/
if (!first_conn) {
mutex_unlock(&ctx->srv_mutex);
if (!first_conn)
return ERR_PTR(-ENXIO);
}
/* need to allocate a new srv */
srv = kzalloc(sizeof(*srv), GFP_KERNEL);
if (!srv) {
mutex_unlock(&ctx->srv_mutex);
if (!srv)
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&srv->paths_list);
mutex_init(&srv->paths_mutex);
@ -1371,8 +1368,6 @@ static struct rtrs_srv *get_or_create_srv(struct rtrs_srv_ctx *ctx,
srv->ctx = ctx;
device_initialize(&srv->dev);
srv->dev.release = rtrs_srv_dev_release;
list_add(&srv->ctx_list, &ctx->srv_list);
mutex_unlock(&ctx->srv_mutex);
srv->chunks = kcalloc(srv->queue_depth, sizeof(*srv->chunks),
GFP_KERNEL);
@ -1385,6 +1380,9 @@ static struct rtrs_srv *get_or_create_srv(struct rtrs_srv_ctx *ctx,
goto err_free_chunks;
}
refcount_set(&srv->refcount, 1);
mutex_lock(&ctx->srv_mutex);
list_add(&srv->ctx_list, &ctx->srv_list);
mutex_unlock(&ctx->srv_mutex);
return srv;
@ -1799,11 +1797,7 @@ static int rtrs_rdma_connect(struct rdma_cm_id *cm_id,
}
recon_cnt = le16_to_cpu(msg->recon_cnt);
srv = get_or_create_srv(ctx, &msg->paths_uuid, msg->first_conn);
/*
* "refcount == 0" happens if a previous thread calls get_or_create_srv
* allocate srv, but chunks of srv are not allocated yet.
*/
if (IS_ERR(srv) || refcount_read(&srv->refcount) == 0) {
if (IS_ERR(srv)) {
err = PTR_ERR(srv);
goto reject_w_err;
}