From 9ae9ab522094406915c27dc729d3ecef7b44af72 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 4 Dec 2013 09:52:58 +0000 Subject: [PATCH] drm/i915: Prevent double unref following alloc failure during execbuffer Whilst looking up the objects required for an execbuffer, an untimely allocation failure in creating the vma results in the object being unreferenced from two lists. The ownership during the lookup is meant to be moved from the list of objects being looked to the vma, and this double unreference upon error results in a use-after-free. Fixes regression from commit 27173f1f95db5e74ceb35fe9a2f2f348ea11bac9 Author: Ben Widawsky Date: Wed Aug 14 11:38:36 2013 +0200 drm/i915: Convert execbuf code to use vmas Based on the fix by Ben Widawsky. Signed-off-by: Chris Wilson Cc: Ben Widawsky Cc: stable@vger.kernel.org [danvet: Bikeshed the crucial comment above the ownership transfer as discussed on irc.] Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_gem_execbuffer.c | 28 +++++++++++++++------- 1 file changed, 20 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index b7e787fb464..a3ba9a8cd68 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -93,7 +93,7 @@ eb_lookup_vmas(struct eb_vmas *eb, { struct drm_i915_gem_object *obj; struct list_head objects; - int i, ret = 0; + int i, ret; INIT_LIST_HEAD(&objects); spin_lock(&file->table_lock); @@ -106,7 +106,7 @@ eb_lookup_vmas(struct eb_vmas *eb, DRM_DEBUG("Invalid object handle %d at index %d\n", exec[i].handle, i); ret = -ENOENT; - goto out; + goto err; } if (!list_empty(&obj->obj_exec_link)) { @@ -114,7 +114,7 @@ eb_lookup_vmas(struct eb_vmas *eb, DRM_DEBUG("Object %p [handle %d, index %d] appears more than once in object list\n", obj, exec[i].handle, i); ret = -EINVAL; - goto out; + goto err; } drm_gem_object_reference(&obj->base); @@ -123,9 +123,13 @@ eb_lookup_vmas(struct eb_vmas *eb, spin_unlock(&file->table_lock); i = 0; - list_for_each_entry(obj, &objects, obj_exec_link) { + while (!list_empty(&objects)) { struct i915_vma *vma; + obj = list_first_entry(&objects, + struct drm_i915_gem_object, + obj_exec_link); + /* * NOTE: We can leak any vmas created here when something fails * later on. But that's no issue since vma_unbind can deal with @@ -138,10 +142,12 @@ eb_lookup_vmas(struct eb_vmas *eb, if (IS_ERR(vma)) { DRM_DEBUG("Failed to lookup VMA\n"); ret = PTR_ERR(vma); - goto out; + goto err; } + /* Transfer ownership from the objects list to the vmas list. */ list_add_tail(&vma->exec_list, &eb->vmas); + list_del_init(&obj->obj_exec_link); vma->exec_entry = &exec[i]; if (eb->and < 0) { @@ -155,16 +161,22 @@ eb_lookup_vmas(struct eb_vmas *eb, ++i; } + return 0; + -out: +err: while (!list_empty(&objects)) { obj = list_first_entry(&objects, struct drm_i915_gem_object, obj_exec_link); list_del_init(&obj->obj_exec_link); - if (ret) - drm_gem_object_unreference(&obj->base); + drm_gem_object_unreference(&obj->base); } + /* + * Objects already transfered to the vmas list will be unreferenced by + * eb_destroy. + */ + return ret; } -- 2.43.2