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| author | Michał Mirosław <mirq-linux@rere.qmqm.pl> | 2017-08-14 23:53:45 +0200 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2017-08-17 17:57:10 +0200 |
| commit | 68d890a3cca5a96a5443972922c84df89f6301e6 (patch) | |
| tree | 7ce0be4cd2aa28f31439234f164a4141bedc431b | |
| parent | 7664b2fa42b5e962dd9ffd9e386dc20cbc966176 (diff) | |
| download | linux-stable-68d890a3cca5a96a5443972922c84df89f6301e6.tar.gz linux-stable-68d890a3cca5a96a5443972922c84df89f6301e6.tar.bz2 linux-stable-68d890a3cca5a96a5443972922c84df89f6301e6.zip | |
drm/tegra: Fix NULL deref in debugfs/iova
When IOMMU is off, ->mm_lock is not initialized and ->mm is NULL.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Thierry Reding <treding@nvidia.com>
| -rw-r--r-- | drivers/gpu/drm/tegra/drm.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c index eddea778290f..86b3e1ce0b65 100644 --- a/drivers/gpu/drm/tegra/drm.c +++ b/drivers/gpu/drm/tegra/drm.c @@ -1033,9 +1033,11 @@ static int tegra_debugfs_iova(struct seq_file *s, void *data) struct tegra_drm *tegra = drm->dev_private; struct drm_printer p = drm_seq_file_printer(s); - mutex_lock(&tegra->mm_lock); - drm_mm_print(&tegra->mm, &p); - mutex_unlock(&tegra->mm_lock); + if (tegra->domain) { + mutex_lock(&tegra->mm_lock); + drm_mm_print(&tegra->mm, &p); + mutex_unlock(&tegra->mm_lock); + } return 0; } |