[PATCH 03/22] drm/tegra: Check whether page belongs to BO in tegra_bo_kmap()

This fixes an OOPS in case of out-of-bounds accessing of a kmap'ed cmdbuf (non-IOMMU allocation) while patching the relocations in do_relocs().

Signed-off-by: Dmitry Osipenko digetx@gmail.com --- drivers/gpu/drm/tegra/gem.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index 424569b53e57..ca0d4439e97b 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -74,6 +74,9 @@ static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page) { struct tegra_bo *obj = host1x_to_tegra_bo(bo);

+ if (page * PAGE_SIZE >= obj->gem.size) + return NULL; + if (obj->vaddr) return obj->vaddr + page * PAGE_SIZE; else if (obj->gem.import_attach)