> -----Original Message----- > From: devel [mailto:driverdev-devel-bounces@xxxxxxxxxxxxxxxxxxxxxx] On > Behalf Of K. Y. Srinivasan > Sent: Monday, March 23, 2015 2:07 PM > To: gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devel@xxxxxxxxxxxxxxxxxxxxxx; ohering@xxxxxxxx; jbottomley@xxxxxxxxxxxxx; > hch@xxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx; apw@xxxxxxxxxxxxx; > vkuznets@xxxxxxxxxx; jasowang@xxxxxxxxxx > Cc: stable@xxxxxxxxxxxxxxx > Subject: [PATCH 5/7] scsi: storvsc: Fix a bug in copy_from_bounce_buffer() > > We may exit this function without properly freeing up the maapings we may > have acquired. Fix the bug. > > Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> Reviewed-by: Long Li <longli@xxxxxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> > --- > drivers/scsi/storvsc_drv.c | 15 ++++++++------- > 1 files changed, 8 insertions(+), 7 deletions(-) > > diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index > 5c13eec..88f5d79 100644 > --- a/drivers/scsi/storvsc_drv.c > +++ b/drivers/scsi/storvsc_drv.c > @@ -754,21 +754,22 @@ static unsigned int copy_to_bounce_buffer(struct > scatterlist *orig_sgl, > if (bounce_sgl[j].length == PAGE_SIZE) { > /* full..move to next entry */ > sg_kunmap_atomic(bounce_addr); > + bounce_addr = 0; > j++; > + } > > - /* if we need to use another bounce buffer */ > - if (srclen || i != orig_sgl_count - 1) > - bounce_addr = > sg_kmap_atomic(bounce_sgl,j); > + /* if we need to use another bounce buffer */ > + if (srclen && bounce_addr == 0) > + bounce_addr = sg_kmap_atomic(bounce_sgl, > j); > > - } else if (srclen == 0 && i == orig_sgl_count - 1) { > - /* unmap the last bounce that is < PAGE_SIZE > */ > - sg_kunmap_atomic(bounce_addr); > - } > } > > sg_kunmap_atomic(src_addr - orig_sgl[i].offset); > } > > + if (bounce_addr) > + sg_kunmap_atomic(bounce_addr); > + > local_irq_restore(flags); > > return total_copied; > -- > 1.7.4.1 > > _______________________________________________ > devel mailing list > devel@xxxxxxxxxxxxxxxxxxxxxx > http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
