From: Zack Rusin <zackr@xxxxxxxxxx>
The res is initialized here only if there's no errors so passing it to
ttm_resource_fini in the error paths results in a kernel oops. In the
error paths, instead of the unitialized res, we have to use to use
node->base on which ttm_resource_init was called.
Sample affected backtrace:
Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d8
Mem abort info:
ESR = 0x96000004
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x04: level 0 translation fault
Data abort info:
ISV = 0, ISS = 0x00000004
CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000106ac0000
[00000000000000d8] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 96000004 [#1] SMP
Modules linked in: bnep vsock_loopback vmw_vsock_virtio_transport_common
vsock snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_hda_codec
snd_hwdep >
CPU: 0 PID: 1197 Comm: gnome-shell Tainted: G U 5.17.0-rc2-vmwgfx #2
Hardware name: VMware, Inc. VBSA/VBSA, BIOS VEFI 12/31/2020
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : ttm_resource_fini+0x5c/0xac [ttm]
lr : ttm_range_man_alloc+0x128/0x1e0 [ttm]
sp : ffff80000d783510
x29: ffff80000d783510 x28: 0000000000000000 x27: ffff000086514400
x26: 0000000000000300 x25: ffff0000809f9e78 x24: 0000000000000000
x23: ffff80000d783680 x22: ffff000086514400 x21: 00000000ffffffe4
x20: ffff80000d7836a0 x19: ffff0000809f9e00 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000800 x12: ffff0000f2600a00
x11: 000000000000fc96 x10: 0000000000000000 x9 : ffff800001295c18
x8 : 0000000000000000 x7 : 0000000000000300 x6 : 0000000000000000
x5 : 0000000000000000 x4 : ffff0000f1034e20 x3 : ffff0000f1034600
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000600000
Call trace:
ttm_resource_fini+0x5c/0xac [ttm]
ttm_range_man_alloc+0x128/0x1e0 [ttm]
ttm_resource_alloc+0x58/0x90 [ttm]
ttm_bo_mem_space+0xc8/0x3e4 [ttm]
ttm_bo_validate+0xb4/0x134 [ttm]
vmw_bo_pin_in_start_of_vram+0xbc/0x200 [vmwgfx]
vmw_framebuffer_pin+0xc0/0x154 [vmwgfx]
vmw_ldu_primary_plane_atomic_update+0x8c/0x6e0 [vmwgfx]
drm_atomic_helper_commit_planes+0x11c/0x2e0
drm_atomic_helper_commit_tail+0x60/0xb0
commit_tail+0x1b0/0x210
drm_atomic_helper_commit+0x168/0x400
drm_atomic_commit+0x64/0x74
drm_atomic_helper_set_config+0xdc/0x11c
drm_mode_setcrtc+0x1c4/0x780
drm_ioctl_kernel+0xd0/0x1a0
drm_ioctl+0x2c4/0x690
vmw_generic_ioctl+0xe0/0x174 [vmwgfx]
vmw_unlocked_ioctl+0x24/0x30 [vmwgfx]
__arm64_sys_ioctl+0xb4/0x100
invoke_syscall+0x78/0x100
el0_svc_common.constprop.0+0x54/0x184
do_el0_svc+0x34/0x9c
el0_svc+0x48/0x1b0
el0t_64_sync_handler+0xa4/0x130
el0t_64_sync+0x1a4/0x1a8
Code: 35000260 f9401a81 52800002 f9403a60 (f9406c23)
---[ end trace 0000000000000000 ]---
Signed-off-by: Zack Rusin <zackr@xxxxxxxxxx>
Fixes: de3688e469b0 ("drm/ttm: add ttm_resource_fini v2")
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Reviewed-by: Martin Krastev <krastevm@xxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_range_manager.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c
index 8cd4f3fb9f79..d91666721dc6 100644
--- a/drivers/gpu/drm/ttm/ttm_range_manager.c
+++ b/drivers/gpu/drm/ttm/ttm_range_manager.c
@@ -89,7 +89,7 @@ static int ttm_range_man_alloc(struct ttm_resource_manager *man,
spin_unlock(&rman->lock);
if (unlikely(ret)) {
- ttm_resource_fini(man, *res);
+ ttm_resource_fini(man, &node->base);
kfree(node);
return ret;
}
--
2.32.0
