Add check for the return value of kstrdup() and return the error
if it fails in order to avoid NULL pointer dereference.

Fixes: c4436c9149c5 ("ipmi_ssif: avoid registering duplicate ssif interface")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
---
 drivers/char/ipmi/ipmi_ssif.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
index 3b921c78ba08..3b87a2726e99 100644
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -1600,6 +1600,11 @@ static int ssif_add_infos(struct i2c_client *client)
 	info->addr_src = SI_ACPI;
 	info->client = client;
 	info->adapter_name = kstrdup(client->adapter->name, GFP_KERNEL);
+	if (!info->adapter_name) {
+		kfree(info);
+		return -ENOMEM;
+	}
+
 	info->binfo.addr = client->addr;
 	list_add_tail(&info->link, &ssif_infos);
 	return 0;
-- 
2.25.1

On Mon, Jun 19, 2023 at 05:28:02PM +0800, Jiasheng Jiang wrote:
> Add check for the return value of kstrdup() and return the error
> if it fails in order to avoid NULL pointer dereference.

Thanks, this is in my next tree.

-corey

> 
> Fixes: c4436c9149c5 ("ipmi_ssif: avoid registering duplicate ssif interface")
> Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
> ---
>  drivers/char/ipmi/ipmi_ssif.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
> index 3b921c78ba08..3b87a2726e99 100644
> --- a/drivers/char/ipmi/ipmi_ssif.c
> +++ b/drivers/char/ipmi/ipmi_ssif.c
> @@ -1600,6 +1600,11 @@ static int ssif_add_infos(struct i2c_client *client)
>  	info->addr_src = SI_ACPI;
>  	info->client = client;
>  	info->adapter_name = kstrdup(client->adapter->name, GFP_KERNEL);
> +	if (!info->adapter_name) {
> +		kfree(info);
> +		return -ENOMEM;
> +	}
> +
>  	info->binfo.addr = client->addr;
>  	list_add_tail(&info->link, &ssif_infos);
>  	return 0;
> -- 
> 2.25.1
>