[2/2] drm/msm: correct attempted NULL pointer dereference in debugfs

Submitted by Brian Masney on May 13, 2019, 11:41 p.m.

Details

Message ID 20190513234105.7531-2-masneyb@onstation.org
State New
Headers show
Series "Series without cover letter" ( rev: 1 ) in Freedreno

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Commit Message

Brian Masney May 13, 2019, 11:41 p.m.
msm_gem_describe() would attempt to dereference a NULL pointer via the
address space pointer when no IOMMU is present. Correct this by adding
the appropriate check.

Signed-off-by: Brian Masney <masneyb@onstation.org>
Fixes: 575f0485508b ("drm/msm: Clean up and enhance the output of the 'gem' debugfs node")
---
 drivers/gpu/drm/msm/msm_gem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 31d5a744d84f..35f55dd25994 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -803,7 +803,8 @@  void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 		seq_puts(m, "      vmas:");
 
 		list_for_each_entry(vma, &msm_obj->vmas, list)
-			seq_printf(m, " [%s: %08llx,%s,inuse=%d]", vma->aspace->name,
+			seq_printf(m, " [%s: %08llx,%s,inuse=%d]",
+				vma->aspace != NULL ? vma->aspace->name : NULL,
 				vma->iova, vma->mapped ? "mapped" : "unmapped",
 				vma->inuse);