On Tue, Jan 25, 2022 at 01:21:20AM +0800, Zhou Qingyang wrote:
> In mpt3sas_transport_port_add(), sas_end_device_alloc() is assigned to rphy
> and there is a dereference of it. sas_end_device_alloc() could return NULL
> on failure of allocation, which could introduce a NULL pointer dereference
> bug.
>
> The same as sas_expander_alloc().
>
> Fix this bug by adding a NULL check of rphy.
>
> This bug was found by a static analyzer.
>
> Builds with 'make allyesconfig' show no new warnings,
> and our static analyzer no longer warns about this code.
>
> Fixes: f92363d12359 ("mpt3sas: add new driver supporting 12GB SAS")
> Signed-off-by: Zhou Qingyang <zhou1615@xxxxxxx>
> ---
> The analysis employs differential checking to identify inconsistent
> security operations (e.g., checks or kfrees) between two code paths
> and confirms that the inconsistent operations are not recovered in the
> current function or the callers, so they constitute bugs.
>
> Note that, as a bug found by static analysis, it can be a false
> positive or hard to trigger. Multiple researchers have cross-reviewed
> the bug.
>
> drivers/scsi/mpt3sas/mpt3sas_transport.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_transport.c b/drivers/scsi/mpt3sas/mpt3sas_transport.c
> index 0681daee6c14..1caa929cf8bc 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_transport.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_transport.c
> @@ -823,6 +823,11 @@ mpt3sas_transport_port_add(struct MPT3SAS_ADAPTER *ioc, u16 handle,
> hba_port->sas_address =
> mpt3sas_port->remote_identify.sas_address;
> }
> + if (!rphy) {
> + ioc_err(ioc, "failure at %s:%d/%s()!\n",
> + __FILE__, __LINE__, __func__);
> + goto out_fail;
> + }
>
> rphy->identify = mpt3sas_port->remote_identify;
>
> --
> 2.25.1
>
As stated before, umn.edu is still not allowed to contribute to the
Linux kernel. Please work with your administration to resolve this
issue.
