diff options
| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2017-07-13 18:23:44 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-05-29 23:39:52 +0300 |
| commit | 814434984a5d2063ac15d7ff9a46075600ff1805 (patch) | |
| tree | 8af7d90fa15ffab53c2501df67a6c35c9311ee3d /drivers/media/platform/omap3isp/isp.c | |
| parent | f42292040d31922ee4e4ea68e2f287fbc3bb2053 (diff) | |
| download | linux-814434984a5d2063ac15d7ff9a46075600ff1805.tar.xz | |
media: omap3isp: Don't rely on devm for memory resource management
devm functions are fine for managing resources that are directly related
to the device at hand and that have no other dependencies. However, a
process holding a file handle to a device created by a driver for a device
may result in the file handle left behind after the device is long gone.
This will result in accessing released (and potentially reallocated)
memory.
Instead, manage the memory resources in the driver. Releasing the
resources can be later on bound to e.g. by releasing a reference.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/platform/omap3isp/isp.c')
| -rw-r--r-- | drivers/media/platform/omap3isp/isp.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c index bd57174d81a7..5f30b802d319 100644 --- a/drivers/media/platform/omap3isp/isp.c +++ b/drivers/media/platform/omap3isp/isp.c @@ -2006,6 +2006,8 @@ static int isp_remove(struct platform_device *pdev) media_entity_enum_cleanup(&isp->crashed); v4l2_async_notifier_cleanup(&isp->notifier); + kfree(isp); + return 0; } @@ -2196,7 +2198,7 @@ static int isp_probe(struct platform_device *pdev) int ret; int i, m; - isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL); + isp = kzalloc(sizeof(*isp), GFP_KERNEL); if (!isp) { dev_err(&pdev->dev, "could not allocate memory\n"); return -ENOMEM; @@ -2205,17 +2207,19 @@ static int isp_probe(struct platform_device *pdev) ret = fwnode_property_read_u32(of_fwnode_handle(pdev->dev.of_node), "ti,phy-type", &isp->phy_type); if (ret) - return ret; + goto error_release_isp; isp->syscon = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "syscon"); - if (IS_ERR(isp->syscon)) - return PTR_ERR(isp->syscon); + if (IS_ERR(isp->syscon)) { + ret = PTR_ERR(isp->syscon); + goto error_release_isp; + } ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, &isp->syscon_offset); if (ret) - return ret; + goto error_release_isp; isp->autoidle = autoidle; @@ -2372,6 +2376,8 @@ error_isp: error: v4l2_async_notifier_cleanup(&isp->notifier); mutex_destroy(&isp->isp_mutex); +error_release_isp: + kfree(isp); return ret; } |