diff mbox series

[net,v2,4/6] netdevsim: use IS_ERR instead of IS_ERR_OR_NULL for debugfs

Message ID 20200127143044.1468-1-ap420073@gmail.com
State Changes Requested
Delegated to: David Miller
Headers show
Series netdevsim: fix a several bugs in netdevsim module | expand

Commit Message

Taehee Yoo Jan. 27, 2020, 2:30 p.m. UTC 
Debugfs APIs return valid pointer or error pointer. it doesn't return NULL.
So, using IS_ERR is enough, not using IS_ERR_OR_NULL.

Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
---

v1 -> v2:
 - Fix use-after-free

 drivers/net/netdevsim/bpf.c    | 10 ++++++----
 drivers/net/netdevsim/dev.c    | 16 ++++++++--------
 drivers/net/netdevsim/health.c |  4 ++--
 3 files changed, 16 insertions(+), 14 deletions(-)

Comments

Jakub Kicinski Jan. 28, 2020, 4:05 a.m. UTC | #1 
On Mon, 27 Jan 2020 14:30:44 +0000, Taehee Yoo wrote:
> Debugfs APIs return valid pointer or error pointer. it doesn't return NULL.
> So, using IS_ERR is enough, not using IS_ERR_OR_NULL.
> 
> Reported-by: kbuild test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Taehee Yoo <ap420073@gmail.com>

Reviewed-by: Jakub Kicinski <kuba@kernel.org>
diff mbox series

Patch

diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c
index 2b74425822ab..0b362b8dac17 100644
--- a/drivers/net/netdevsim/bpf.c
+++ b/drivers/net/netdevsim/bpf.c
@@ -218,6 +218,7 @@  static int nsim_bpf_create_prog(struct nsim_dev *nsim_dev,
 {
 	struct nsim_bpf_bound_prog *state;
 	char name[16];
+	int ret;
 
 	state = kzalloc(sizeof(*state), GFP_KERNEL);
 	if (!state)
@@ -230,9 +231,10 @@  static int nsim_bpf_create_prog(struct nsim_dev *nsim_dev,
 	/* Program id is not populated yet when we create the state. */
 	sprintf(name, "%u", nsim_dev->prog_id_gen++);
 	state->ddir = debugfs_create_dir(name, nsim_dev->ddir_bpf_bound_progs);
-	if (IS_ERR_OR_NULL(state->ddir)) {
+	if (IS_ERR(state->ddir)) {
+		ret = PTR_ERR(state->ddir);
 		kfree(state);
-		return -ENOMEM;
+		return ret;
 	}
 
 	debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
@@ -587,8 +589,8 @@  int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
 
 	nsim_dev->ddir_bpf_bound_progs = debugfs_create_dir("bpf_bound_progs",
 							    nsim_dev->ddir);
-	if (IS_ERR_OR_NULL(nsim_dev->ddir_bpf_bound_progs))
-		return -ENOMEM;
+	if (IS_ERR(nsim_dev->ddir_bpf_bound_progs))
+		return PTR_ERR(nsim_dev->ddir_bpf_bound_progs);
 
 	nsim_dev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops, nsim_dev);
 	err = PTR_ERR_OR_ZERO(nsim_dev->bpf_dev);
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 2c23b232926b..955da8da72db 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -91,11 +91,11 @@  static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
 
 	sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
 	nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
-	if (IS_ERR_OR_NULL(nsim_dev->ddir))
-		return PTR_ERR_OR_ZERO(nsim_dev->ddir) ?: -EINVAL;
+	if (IS_ERR(nsim_dev->ddir))
+		return PTR_ERR(nsim_dev->ddir);
 	nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir);
-	if (IS_ERR_OR_NULL(nsim_dev->ports_ddir))
-		return PTR_ERR_OR_ZERO(nsim_dev->ports_ddir) ?: -EINVAL;
+	if (IS_ERR(nsim_dev->ports_ddir))
+		return PTR_ERR(nsim_dev->ports_ddir);
 	debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir,
 			    &nsim_dev->fw_update_status);
 	debugfs_create_u32("max_macs", 0600, nsim_dev->ddir,
@@ -126,8 +126,8 @@  static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
 	sprintf(port_ddir_name, "%u", nsim_dev_port->port_index);
 	nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name,
 						 nsim_dev->ports_ddir);
-	if (IS_ERR_OR_NULL(nsim_dev_port->ddir))
-		return -ENOMEM;
+	if (IS_ERR(nsim_dev_port->ddir))
+		return PTR_ERR(nsim_dev_port->ddir);
 
 	sprintf(dev_link_name, "../../../" DRV_NAME "%u",
 		nsim_dev->nsim_bus_dev->dev.id);
@@ -939,8 +939,8 @@  int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
 int nsim_dev_init(void)
 {
 	nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
-	if (IS_ERR_OR_NULL(nsim_dev_ddir))
-		return -ENOMEM;
+	if (IS_ERR(nsim_dev_ddir))
+		return PTR_ERR(nsim_dev_ddir);
 	return 0;
 }
 
diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c
index 9aa637d162eb..30595b1299bd 100644
--- a/drivers/net/netdevsim/health.c
+++ b/drivers/net/netdevsim/health.c
@@ -285,8 +285,8 @@  int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink)
 	}
 
 	health->ddir = debugfs_create_dir("health", nsim_dev->ddir);
-	if (IS_ERR_OR_NULL(health->ddir)) {
-		err = PTR_ERR_OR_ZERO(health->ddir) ?: -EINVAL;
+	if (IS_ERR(health->ddir)) {
+		err = PTR_ERR(health->ddir);
 		goto err_dummy_reporter_destroy;
 	}