On Mon, Jun 12, 2017 at 05:02:23PM -0500, Gustavo A. R. Silva wrote:
> NULL check at line 76: if (conn_info) {, implies that pointer conn_info
> might be NULL, but this pointer is being previously dereferenced,
> which might cause a NULL pointer dereference.
>
> Add NULL check before dereferencing pointer conn_info in order to
> avoid a potential NULL pointer dereference.
>
> Addresses-Coverity-ID: 1362349
> Signed-off-by: Gustavo A. R. Silva <garsilva@xxxxxxxxxxxxxx>
> ---
> net/nfc/nci/core.c | 11 +++++------
> 1 file changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
> index 61fff42..d2198ce 100644
> --- a/net/nfc/nci/core.c
> +++ b/net/nfc/nci/core.c
> @@ -70,14 +70,13 @@ int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
> struct nci_conn_info *conn_info;
>
> list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
conn_info is set in list_for_each_entry() using container_of(),
which is never NULL. Plus, it is dereferenced there as well.
The check is unnecessary.
Guenter
> - if (conn_info->dest_type == dest_type) {
> + if (conn_info && conn_info->dest_type == dest_type) {
> if (!params)
> return conn_info->conn_id;
> - if (conn_info) {
> - if (params->id == conn_info->dest_params->id &&
> - params->protocol == conn_info->dest_params->protocol)
> - return conn_info->conn_id;
> - }
> +
> + if (params->id == conn_info->dest_params->id &&
> + params->protocol == conn_info->dest_params->protocol)
> + return conn_info->conn_id;
> }
> }
>
