| Message ID | 20201001075408.25508-7-colyli@suse.de |
|---|---|
| State | New |
| Headers | show |
| Series | Introduce sendpage_ok() to detect misused sendpage in network related drivers | expand |
On 10/1/20 12:54 AM, Coly Li wrote: > In iscsci driver, iscsi_tcp_segment_map() uses the following code to > check whether the page should or not be handled by sendpage: > if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg))) > > The "page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)" part is to > make sure the page can be sent to network layer's zero copy path. This > part is exactly what sendpage_ok() does. > > This patch uses use sendpage_ok() in iscsi_tcp_segment_map() to replace > the original open coded checks. > > Signed-off-by: Coly Li <colyli@suse.de> > Acked-by: Martin K. Petersen <martin.petersen@oracle.com> > Cc: Vasily Averin <vvs@virtuozzo.com> > Cc: Cong Wang <amwang@redhat.com> > Cc: Mike Christie <michaelc@cs.wisc.edu> > Cc: Lee Duncan <lduncan@suse.com> > Cc: Chris Leech <cleech@redhat.com> > Cc: Christoph Hellwig <hch@lst.de> > Cc: Hannes Reinecke <hare@suse.de> > --- > drivers/scsi/libiscsi_tcp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c > index 37e5d4e48c2f..83f14b2c8804 100644 > --- a/drivers/scsi/libiscsi_tcp.c > +++ b/drivers/scsi/libiscsi_tcp.c > @@ -128,7 +128,7 @@ static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) > * coalescing neighboring slab objects into a single frag which > * triggers one of hardened usercopy checks. > */ > - if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg))) > + if (!recv && sendpage_ok(sg_page(sg))) > return; > > if (recv) { > Reviewed-by: Lee Duncan <lduncan@suse.com>
diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c index 37e5d4e48c2f..83f14b2c8804 100644 --- a/drivers/scsi/libiscsi_tcp.c +++ b/drivers/scsi/libiscsi_tcp.c @@ -128,7 +128,7 @@ static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv) * coalescing neighboring slab objects into a single frag which * triggers one of hardened usercopy checks. */ - if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg))) + if (!recv && sendpage_ok(sg_page(sg))) return; if (recv) {
In iscsci driver, iscsi_tcp_segment_map() uses the following code to check whether the page should or not be handled by sendpage: if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg))) The "page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)" part is to make sure the page can be sent to network layer's zero copy path. This part is exactly what sendpage_ok() does. This patch uses use sendpage_ok() in iscsi_tcp_segment_map() to replace the original open coded checks. Signed-off-by: Coly Li <colyli@suse.de> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Cc: Vasily Averin <vvs@virtuozzo.com> Cc: Cong Wang <amwang@redhat.com> Cc: Mike Christie <michaelc@cs.wisc.edu> Cc: Lee Duncan <lduncan@suse.com> Cc: Chris Leech <cleech@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> --- drivers/scsi/libiscsi_tcp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)