From 90f94660e53189755676543954101de78c26253b Mon Sep 17 00:00:00 2001 From: Brian Masney Date: Mon, 13 May 2019 19:41:05 -0400 Subject: [PATCH] drm/msm: correct attempted NULL pointer dereference in debugfs 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 Fixes: 575f0485508b ("drm/msm: Clean up and enhance the output of the 'gem' debugfs node") Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/20190513234105.7531-2-masneyb@onstation.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 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);