The value of struct drm_device.ttm.type_vram can become -1 for unknown
types of memory (see nouveau_ttm_init()). This leads to an out-of-bounds
error when accessing struct nvif_mmu.type[]:
[ 18.304116] ==================================================================
[ 18.311649] BUG: KASAN: slab-out-of-bounds in nouveau_ttm_io_mem_reserve+0x17a/0x7e0 [nouveau]
[ 18.320415] Read of size 1 at addr ffff88810ffac1fe by task systemd-udevd/342
[ 18.327681]
[ 18.329208] CPU: 1 PID: 342 Comm: systemd-udevd Tainted: G E 5.10.0-rc2-1-default+ #581
[ 18.338681] Hardware name: Dell Inc. OptiPlex 9020/0N4YC8, BIOS A24 10/24/2018
[ 18.346032] Call Trace:
[ 18.348536] dump_stack+0xae/0xe5
[ 18.351919] print_address_description.constprop.0+0x17/0xf0
[ 18.357787] ? nouveau_ttm_io_mem_reserve+0x17a/0x7e0 [nouveau]
[ 18.363818] __kasan_report.cold+0x20/0x38
[ 18.368099] ? nouveau_ttm_io_mem_reserve+0x17a/0x7e0 [nouveau]
[ 18.374133] kasan_report+0x3a/0x50
[ 18.377789] nouveau_ttm_io_mem_reserve+0x17a/0x7e0 [nouveau]
<...>
[ 18.767690] Allocated by task 342:
[ 18.773087] kasan_save_stack+0x1b/0x40
[ 18.778890] __kasan_kmalloc.constprop.0+0xbf/0xd0
[ 18.785646] __kmalloc_track_caller+0x1be/0x390
[ 18.792165] kstrdup_const+0x46/0x70
[ 18.797686] kobject_set_name_vargs+0x2f/0xb0
[ 18.803992] kobject_init_and_add+0x9d/0xf0
[ 18.810117] ttm_mem_global_init+0x12c/0x210 [ttm]
[ 18.816853] ttm_bo_global_init+0x4a/0x160 [ttm]
[ 18.823420] ttm_bo_device_init+0x39/0x220 [ttm]
[ 18.830046] nouveau_ttm_init+0x2c3/0x830 [nouveau]
[ 18.836929] nouveau_drm_device_init+0x1b4/0x3f0 [nouveau]
<...>
[ 19.105336] ==================================================================
Fix this error, by not using type_vram as an index if it's negative.
Assume default values instead.
The error was seen on Nvidia G72 hardware.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Fixes: 1cf65c45183a ("drm/ttm: add caching state to ttm_bus_placement")
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: "Christian König" <christian.koenig@xxxxxxx>
Cc: VMware Graphics <linux-graphics-maintainer@xxxxxxxxxx>
Cc: Roland Scheidegger <sroland@xxxxxxxxxx>
Cc: Huang Rui <ray.huang@xxxxxxx>
Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Cc: Hawking Zhang <Hawking.Zhang@xxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Likun Gao <Likun.Gao@xxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: nouveau@xxxxxxxxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: spice-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
---
drivers/gpu/drm/nouveau/nouveau_bo.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 8133377d865d..fe15299d417e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1142,9 +1142,12 @@ nouveau_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_resource *reg)
struct nvkm_device *device = nvxx_device(&drm->client.device);
struct nouveau_mem *mem = nouveau_mem(reg);
struct nvif_mmu *mmu = &drm->client.mmu;
- const u8 type = mmu->type[drm->ttm.type_vram].type;
+ u8 type = 0;
int ret;
+ if (drm->ttm.type_vram >= 0)
+ type = mmu->type[drm->ttm.type_vram].type;
+
mutex_lock(&drm->ttm.io_reserve_mutex);
retry:
switch (reg->mem_type) {
--
2.29.2
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