From: Elena Reshetova <elena.reshetova@intel.com>
To: gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
netdev@vger.kernel.org, linux1394-devel@lists.sourceforge.net,
linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org,
linux-media@vger.kernel.org, devel@linuxdriverproject.org,
linux-pci@vger.kernel.org, linux-s390@vger.kernel.org,
fcoe-devel@open-fcoe.org, linux-scsi@vger.kernel.org,
open-iscsi@googlegroups.com, devel@driverdev.osuosl.org,
target-devel@vger.kernel.org, linux-serial@vger.kernel.org,
linux-usb@vger.kernel.org, peterz@infradead.org,
Elena Reshetova <elena.reshetova@intel.com>,
Hans Liljestrand <ishkamiel@gmail.com>,
Kees Cook <keescook@chromium.org>,
David Windsor <dwindsor@gmail.com>
Subject: [PATCH 11/29] drivers, media: convert cx88_core.refcount from atomic_t to refcount_t
Date: Mon, 6 Mar 2017 16:20:58 +0200 [thread overview]
Message-ID: <1488810076-3754-12-git-send-email-elena.reshetova@intel.com> (raw)
In-Reply-To: <1488810076-3754-1-git-send-email-elena.reshetova@intel.com>
refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
---
drivers/media/pci/cx88/cx88-cards.c | 2 +-
drivers/media/pci/cx88/cx88-core.c | 4 ++--
drivers/media/pci/cx88/cx88.h | 3 ++-
3 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/media/pci/cx88/cx88-cards.c b/drivers/media/pci/cx88/cx88-cards.c
index cdfbde2..7fc5f5f 100644
--- a/drivers/media/pci/cx88/cx88-cards.c
+++ b/drivers/media/pci/cx88/cx88-cards.c
@@ -3670,7 +3670,7 @@ struct cx88_core *cx88_core_create(struct pci_dev *pci, int nr)
if (!core)
return NULL;
- atomic_inc(&core->refcount);
+ refcount_set(&core->refcount, 1);
core->pci_bus = pci->bus->number;
core->pci_slot = PCI_SLOT(pci->devfn);
core->pci_irqmask = PCI_INT_RISC_RD_BERRINT | PCI_INT_RISC_WR_BERRINT |
diff --git a/drivers/media/pci/cx88/cx88-core.c b/drivers/media/pci/cx88/cx88-core.c
index 973a9cd4..8bfa5b7 100644
--- a/drivers/media/pci/cx88/cx88-core.c
+++ b/drivers/media/pci/cx88/cx88-core.c
@@ -1052,7 +1052,7 @@ struct cx88_core *cx88_core_get(struct pci_dev *pci)
mutex_unlock(&devlist);
return NULL;
}
- atomic_inc(&core->refcount);
+ refcount_inc(&core->refcount);
mutex_unlock(&devlist);
return core;
}
@@ -1073,7 +1073,7 @@ void cx88_core_put(struct cx88_core *core, struct pci_dev *pci)
release_mem_region(pci_resource_start(pci, 0),
pci_resource_len(pci, 0));
- if (!atomic_dec_and_test(&core->refcount))
+ if (!refcount_dec_and_test(&core->refcount))
return;
mutex_lock(&devlist);
diff --git a/drivers/media/pci/cx88/cx88.h b/drivers/media/pci/cx88/cx88.h
index 115414c..16c1313 100644
--- a/drivers/media/pci/cx88/cx88.h
+++ b/drivers/media/pci/cx88/cx88.h
@@ -24,6 +24,7 @@
#include <linux/i2c-algo-bit.h>
#include <linux/videodev2.h>
#include <linux/kdev_t.h>
+#include <linux/refcount.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fh.h>
@@ -339,7 +340,7 @@ struct cx8802_dev;
struct cx88_core {
struct list_head devlist;
- atomic_t refcount;
+ refcount_t refcount;
/* board name */
int nr;
--
2.7.4
next prev parent reply other threads:[~2017-03-06 14:27 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-06 14:20 [PATCH 00/29] drivers, mics refcount conversions Elena Reshetova
2017-03-06 14:20 ` [PATCH 01/29] drivers, block: convert xen_blkif.refcnt from atomic_t to refcount_t Elena Reshetova
2017-03-06 14:20 ` [PATCH 02/29] drivers, firewire: convert fw_node.ref_count " Elena Reshetova
2017-03-06 14:20 ` [PATCH 03/29] drivers, char: convert vma_data.refcnt " Elena Reshetova
2017-03-06 14:20 ` [PATCH 04/29] drivers, connector: convert cn_callback_entry.refcnt " Elena Reshetova
2017-03-06 14:20 ` [PATCH 05/29] drivers, md, bcache: convert cached_dev.count " Elena Reshetova
2017-03-06 14:20 ` [PATCH 06/29] drivers, md: convert dm_cache_metadata.ref_count " Elena Reshetova
2017-03-06 14:20 ` [PATCH 07/29] drivers, md: convert dm_dev_internal.count " Elena Reshetova
2017-03-06 14:20 ` [PATCH 08/29] drivers, md: convert mddev.active " Elena Reshetova
2017-03-07 19:04 ` Shaohua Li
2017-03-08 9:42 ` Reshetova, Elena
2017-03-08 10:19 ` gregkh
2017-03-14 12:11 ` Michael Ellerman
2017-03-14 12:29 ` Reshetova, Elena
2017-03-14 14:58 ` James Bottomley
2017-03-16 18:00 ` Reshetova, Elena
2017-03-06 14:20 ` [PATCH 09/29] drivers, md: convert table_device.count " Elena Reshetova
2017-03-06 14:20 ` [PATCH 10/29] drivers, md: convert stripe_head.count " Elena Reshetova
2017-03-07 19:07 ` Shaohua Li
2017-03-08 9:39 ` Reshetova, Elena
2017-03-06 14:20 ` Elena Reshetova [this message]
2017-03-06 16:26 ` [PATCH 11/29] drivers, media: convert cx88_core.refcount " Sergei Shtylyov
2017-03-07 7:52 ` Reshetova, Elena
2017-03-07 10:40 ` Sergei Shtylyov
2017-03-07 8:22 ` Sakari Ailus
2017-03-06 14:20 ` [PATCH 12/29] drivers, media: convert s2255_dev.num_channels " Elena Reshetova
2017-03-07 8:30 ` Sakari Ailus
2017-03-07 14:45 ` Reshetova, Elena
2017-03-06 14:21 ` [PATCH 13/29] drivers, media: convert vb2_vmarea_handler.refcount " Elena Reshetova
2017-03-07 8:50 ` Sakari Ailus
2017-03-07 14:48 ` Reshetova, Elena
2017-03-06 14:21 ` [PATCH 14/29] drivers, media: convert vb2_dc_buf.refcount " Elena Reshetova
2017-03-06 14:21 ` [PATCH 15/29] drivers, media: convert vb2_dma_sg_buf.refcount " Elena Reshetova
2017-03-06 14:21 ` [PATCH 16/29] drivers, media: convert vb2_vmalloc_buf.refcount " Elena Reshetova
2017-03-06 14:21 ` [PATCH 17/29] drivers, pci: convert hv_pci_dev.refs " Elena Reshetova
2017-03-06 21:38 ` Bjorn Helgaas
2017-03-07 19:58 ` Stephen Hemminger
2017-04-18 10:40 ` Reshetova, Elena
2017-04-18 14:05 ` Bjorn Helgaas
2017-04-18 14:29 ` Reshetova, Elena
2017-03-06 14:21 ` [PATCH 18/29] drivers, s390: convert urdev.ref_count " Elena Reshetova
2017-03-06 14:21 ` [PATCH 19/29] drivers, s390: convert lcs_reply.refcnt " Elena Reshetova
2017-03-06 14:21 ` [PATCH 20/29] drivers, s390: convert qeth_reply.refcnt " Elena Reshetova
2017-03-06 14:21 ` [PATCH 21/29] drivers, s390: convert fc_fcp_pkt.ref_cnt " Elena Reshetova
2017-03-06 15:27 ` Johannes Thumshirn
2017-03-06 16:54 ` Benjamin Block
2017-03-07 7:50 ` Reshetova, Elena
2017-03-08 13:48 ` Reshetova, Elena
2017-03-08 14:06 ` Johannes Thumshirn
2017-03-06 14:21 ` [PATCH 22/29] drivers, scsi: convert iscsi_task.refcount " Elena Reshetova
2017-03-08 18:47 ` Chris Leech
2017-03-09 7:18 ` Reshetova, Elena
2017-03-09 8:43 ` Johannes Thumshirn
2017-03-09 9:26 ` Reshetova, Elena
2017-03-09 9:32 ` Johannes Thumshirn
2017-03-06 14:21 ` [PATCH 23/29] drivers: convert vme_user_vma_priv.refcnt " Elena Reshetova
2017-03-06 14:21 ` [PATCH 24/29] drivers: convert iblock_req.pending " Elena Reshetova
2017-03-08 7:37 ` Nicholas A. Bellinger
2017-03-21 7:18 ` Nicholas A. Bellinger
2017-03-06 14:21 ` [PATCH 25/29] drivers, usb: convert ffs_data.ref " Elena Reshetova
2017-03-06 14:21 ` [PATCH 26/29] drivers, usb: convert dev_data.count " Elena Reshetova
2017-03-06 14:21 ` [PATCH 27/29] drivers, usb: convert ep_data.count " Elena Reshetova
2017-03-06 14:21 ` [PATCH 28/29] drivers: convert sbd_duart.map_guard " Elena Reshetova
2017-03-06 14:21 ` [PATCH 29/29] drivers, xen: convert grant_map.users " Elena Reshetova
2017-03-06 16:58 ` [Xen-devel] " Boris Ostrovsky
2017-03-08 13:49 ` Reshetova, Elena
2017-03-08 17:45 ` Boris Ostrovsky
2017-03-09 7:19 ` Reshetova, Elena
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