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drm/msm: correct attempted NULL pointer dereference in debugfs

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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: 575f048550 ("drm/msm: Clean up and enhance the output of the 'gem' debugfs node")
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190513234105.7531-2-masneyb@onstation.org
This commit is contained in:
Brian Masney 2019-05-13 19:41:05 -04:00 committed by Sean Paul
parent e2f597a204
commit 90f94660e5
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/msm/msm_gem.c
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@ -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);