On Tue, Jul 21, 2015 at 05:36:45PM +0530, Sudip Mukherjee wrote:
> While creating the debugfs file we are setting the inode->i_private to
> dev. That same dev is passed to these functions as private of struct
> seq_file via single_open(). Moreover single_open is setting
> file->private_data->private to dev.
> So at this point it can never be NULL.
> This check was added by commit eb3394faeb97 ("drm/i915: Add debugfs test
> control files for Displayport compliance testing")
>
Still missing
Cc: Chris Wilson ...
Cc: Todd Previte ...
here to make sure reviewers/original authors are in the loop. Anyway this
is a simple enough patch, so I just pulled them both in.
Thanks, Daniel
> Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
> ---
>
> v3: removed the check in i915_displayport_test_active_write also
> v2: removed null check
> v1 was drm/i915: fix possible null pointer dereference
>
> drivers/gpu/drm/i915/i915_debugfs.c | 21 +--------------------
> 1 file changed, 1 insertion(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index bc817da..ffce62e 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4028,24 +4028,14 @@ static ssize_t i915_displayport_test_active_write(struct file *file,
> {
> char *input_buffer;
> int status = 0;
> - struct seq_file *m;
> struct drm_device *dev;
> struct drm_connector *connector;
> struct list_head *connector_list;
> struct intel_dp *intel_dp;
> int val = 0;
>
> - m = file->private_data;
> - if (!m) {
> - status = -ENODEV;
> - return status;
> - }
> - dev = m->private;
> + dev = ((struct seq_file *)file->private_data)->private;
>
> - if (!dev) {
> - status = -ENODEV;
> - return status;
> - }
> connector_list = &dev->mode_config.connector_list;
>
> if (len == 0)
> @@ -4103,9 +4093,6 @@ static int i915_displayport_test_active_show(struct seq_file *m, void *data)
> struct list_head *connector_list = &dev->mode_config.connector_list;
> struct intel_dp *intel_dp;
>
> - if (!dev)
> - return -ENODEV;
> -
> list_for_each_entry(connector, connector_list, head) {
>
> if (connector->connector_type !=
> @@ -4150,9 +4137,6 @@ static int i915_displayport_test_data_show(struct seq_file *m, void *data)
> struct list_head *connector_list = &dev->mode_config.connector_list;
> struct intel_dp *intel_dp;
>
> - if (!dev)
> - return -ENODEV;
> -
> list_for_each_entry(connector, connector_list, head) {
>
> if (connector->connector_type !=
> @@ -4192,9 +4176,6 @@ static int i915_displayport_test_type_show(struct seq_file *m, void *data)
> struct list_head *connector_list = &dev->mode_config.connector_list;
> struct intel_dp *intel_dp;
>
> - if (!dev)
> - return -ENODEV;
> -
> list_for_each_entry(connector, connector_list, head) {
>
> if (connector->connector_type !=
> --
> 1.8.1.2
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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