| Message ID | 20210806074252.398482-2-damien.lemoal@wdc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | libata cleanups and improvements | expand |
On 8/6/21 9:42 AM, Damien Le Moal wrote: > Avoid a potential NULL pointer dereference by testing that the ATA port > info variable "pi". > > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> > --- > drivers/ata/libata-core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c > index 61c762961ca8..ea8b91297f12 100644 > --- a/drivers/ata/libata-core.c > +++ b/drivers/ata/libata-core.c > @@ -5458,7 +5458,7 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev, > ap->link.flags |= pi->link_flags; > ap->ops = pi->port_ops; > > - if (!host->ops && (pi->port_ops != &ata_dummy_port_ops)) > + if (!host->ops && pi && pi->port_ops != &ata_dummy_port_ops) > host->ops = pi->port_ops; > } > > Reviewed-by: Hannes Reinecke <hare@suse.de> Cheers, Hannes
On Fri, 2021-08-06 at 16:42 +0900, Damien Le Moal wrote: > Avoid a potential NULL pointer dereference by testing that the ATA > port > info variable "pi". > > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> > --- > drivers/ata/libata-core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c > index 61c762961ca8..ea8b91297f12 100644 > --- a/drivers/ata/libata-core.c > +++ b/drivers/ata/libata-core.c > @@ -5458,7 +5458,7 @@ struct ata_host *ata_host_alloc_pinfo(struct > device *dev, > ap->link.flags |= pi->link_flags; > ap->ops = pi->port_ops; Hey, pi is used here > > - if (!host->ops && (pi->port_ops != > &ata_dummy_port_ops)) > + if (!host->ops && pi && pi->port_ops != > &ata_dummy_port_ops) So checking it here is just going to get us a load of static checker reports. James
On 2021/08/06 23:25, James Bottomley wrote: > On Fri, 2021-08-06 at 16:42 +0900, Damien Le Moal wrote: >> Avoid a potential NULL pointer dereference by testing that the ATA >> port >> info variable "pi". >> >> Reported-by: kernel test robot <lkp@intel.com> >> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> >> --- >> drivers/ata/libata-core.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c >> index 61c762961ca8..ea8b91297f12 100644 >> --- a/drivers/ata/libata-core.c >> +++ b/drivers/ata/libata-core.c >> @@ -5458,7 +5458,7 @@ struct ata_host *ata_host_alloc_pinfo(struct >> device *dev, >> ap->link.flags |= pi->link_flags; >> ap->ops = pi->port_ops; > > Hey, pi is used here > >> >> - if (!host->ops && (pi->port_ops != >> &ata_dummy_port_ops)) >> + if (!host->ops && pi && pi->port_ops != >> &ata_dummy_port_ops) > > So checking it here is just going to get us a load of static checker > reports. I got a load of static checker warnings already before sending this :) And I got lost in that load obviously. Will check again. > > James > > >
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 61c762961ca8..ea8b91297f12 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5458,7 +5458,7 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev, ap->link.flags |= pi->link_flags; ap->ops = pi->port_ops; - if (!host->ops && (pi->port_ops != &ata_dummy_port_ops)) + if (!host->ops && pi && pi->port_ops != &ata_dummy_port_ops) host->ops = pi->port_ops; }
Avoid a potential NULL pointer dereference by testing that the ATA port info variable "pi". Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> --- drivers/ata/libata-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)