From: Brian Masney masneyb@onstation.org

[ Upstream commit 90f94660e53189755676543954101de78c26253b ]

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") Signed-off-by: Sean Paul seanpaul@chromium.org Link: https://patchwork.freedesktop.org/patch/msgid/20190513234105.7531-2-masneyb@... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/msm/msm_gem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 18ca651ab942a..23de4d1b7b1ac 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -805,7 +805,8 @@ 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);