[PATCH 5.9 708/757] drm: fix double free for gbo in drm_gem_vram_init and drm_gem_vram_create

Greg Kroah-Hartman
2020-10-27T16:28:30Z

From: Jia Yang <jiayang5@huawei.com>

[ Upstream commit da62cb7230f0871c30dc9789071f63229158d261 ]

I got a use-after-free report when doing some fuzz test:

If ttm_bo_init() fails, the "gbo" and "gbo->bo.base" will be
freed by ttm_buffer_object_destroy() in ttm_bo_init(). But
then drm_gem_vram_create() and drm_gem_vram_init() will free
"gbo" and "gbo->bo.base" again.

BUG: KMSAN: use-after-free in drm_vma_offset_remove+0xb3/0x150
CPU: 0 PID: 24282 Comm: syz-executor.1 Tainted: G B W 5.7.0-rc4-msan #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
__dump_stack
dump_stack+0x1c9/0x220
kmsan_report+0xf7/0x1e0
__msan_warning+0x58/0xa0
drm_vma_offset_remove+0xb3/0x150
drm_gem_free_mmap_offset
drm_gem_object_release+0x159/0x180
drm_gem_vram_init
drm_gem_vram_create+0x7c5/0x990
drm_gem_vram_fill_create_dumb
drm_gem_vram_driver_dumb_create+0x238/0x590
drm_mode_create_dumb
drm_mode_create_dumb_ioctl+0x41d/0x450
drm_ioctl_kernel+0x5a4/0x710
drm_ioctl+0xc6f/0x1240
vfs_ioctl
ksys_ioctl
__do_sys_ioctl
__se_sys_ioctl+0x2e9/0x410
__x64_sys_ioctl+0x4a/0x70
do_syscall_64+0xb8/0x160
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4689b9
Code: fd e0 fa ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb e0 fa ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f368fa4dc98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000076bf00 RCX: 00000000004689b9
RDX: 0000000020000240 RSI: 00000000c02064b2 RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000004d17e0 R14: 00007f368fa4e6d4 R15: 000000000076bf0c

Uninit was created at:
kmsan_save_stack_with_flags
kmsan_internal_poison_shadow+0x66/0xd0
kmsan_slab_free+0x6e/0xb0
slab_free_freelist_hook
slab_free
kfree+0x571/0x30a0
drm_gem_vram_destroy
ttm_buffer_object_destroy+0xc8/0x130
ttm_bo_release
kref_put
ttm_bo_put+0x117d/0x23e0
ttm_bo_init_reserved+0x11c0/0x11d0
ttm_bo_init+0x289/0x3f0
drm_gem_vram_init
drm_gem_vram_create+0x775/0x990
drm_gem_vram_fill_create_dumb
drm_gem_vram_driver_dumb_create+0x238/0x590
drm_mode_create_dumb
drm_mode_create_dumb_ioctl+0x41d/0x450
drm_ioctl_kernel+0x5a4/0x710
drm_ioctl+0xc6f/0x1240
vfs_ioctl
ksys_ioctl
__do_sys_ioctl
__se_sys_ioctl+0x2e9/0x410
__x64_sys_ioctl+0x4a/0x70
do_syscall_64+0xb8/0x160
entry_SYSCALL_64_after_hwframe+0x44/0xa9

If ttm_bo_init() fails, the "gbo" will be freed by
ttm_buffer_object_destroy() in ttm_bo_init(). But then
drm_gem_vram_create() and drm_gem_vram_init() will free
"gbo" again.

Reported-by: Hulk Robot <hulkci@huawei.com>
Reported-by: butt3rflyh4ck <butterflyhuangxx@gmail.com>
Signed-off-by: Jia Yang <jiayang5@huawei.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20200714083238.28479-2-tzimmermann@suse.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/drm_gem_vram_helper.c | 28 +++++++++++++++------------
1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index 3296ed3df3580..8b65ca164bf4b 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -167,6 +167,10 @@ static void drm_gem_vram_placement(struct drm_gem_vram_object *gbo,
}
}

+/*
+ * Note that on error, drm_gem_vram_init will free the buffer object.
+ */
+
static int drm_gem_vram_init(struct drm_device *dev,
struct drm_gem_vram_object *gbo,
size_t size, unsigned long pg_align)
@@ -176,15 +180,19 @@ static int drm_gem_vram_init(struct drm_device *dev,
int ret;
size_t acc_size;

- if (WARN_ONCE(!vmm, "VRAM MM not initialized"))
+ if (WARN_ONCE(!vmm, "VRAM MM not initialized")) {
+ kfree(gbo);
return -EINVAL;
+ }
bdev = &vmm->bdev;

gbo->bo.base.funcs = &drm_gem_vram_object_funcs;

ret = drm_gem_object_init(dev, &gbo->bo.base, size);
- if (ret)
+ if (ret) {
+ kfree(gbo);
return ret;
+ }

acc_size = ttm_bo_dma_acc_size(bdev, size, sizeof(*gbo));

@@ -195,13 +203,13 @@ static int drm_gem_vram_init(struct drm_device *dev,
&gbo->placement, pg_align, false, acc_size,
NULL, NULL, ttm_buffer_object_destroy);
if (ret)
- goto err_drm_gem_object_release;
+ /*
+ * A failing ttm_bo_init will call ttm_buffer_object_destroy
+ * to release gbo->bo.base and kfree gbo.
+ */
+ return ret;

return 0;
-
-err_drm_gem_object_release:
- drm_gem_object_release(&gbo->bo.base);
- return ret;
}

/**
@@ -235,13 +243,9 @@ struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,

ret = drm_gem_vram_init(dev, gbo, size, pg_align);
if (ret < 0)
- goto err_kfree;
+ return ERR_PTR(ret);

return gbo;
-
-err_kfree:
- kfree(gbo);
- return ERR_PTR(ret);
}
EXPORT_SYMBOL(drm_gem_vram_create);

--
2.25.1