From: Tina Zhang tina.zhang@intel.com
commit 387a4c2b55291b37e245c840813bd8a8bd06ed49 upstream.
Stack struct intel_gvt_gtt_entry value needs to be initialized before being used, as the fields may contain garbage values.
W/o this patch, set_ggtt_entry prints: ------------------------------------- 274.046840: set_ggtt_entry: vgpu1:set ggtt entry 0x9bed8000ffffe900 274.046846: set_ggtt_entry: vgpu1:set ggtt entry 0xe55df001 274.046852: set_ggtt_entry: vgpu1:set ggtt entry 0x9bed8000ffffe900
0x9bed8000 is the stack grabage.
W/ this patch, set_ggtt_entry prints: ------------------------------------ 274.046840: set_ggtt_entry: vgpu1:set ggtt entry 0xffffe900 274.046846: set_ggtt_entry: vgpu1:set ggtt entry 0xe55df001 274.046852: set_ggtt_entry: vgpu1:set ggtt entry 0xffffe900
v2: - Initialize during declaration. (Zhenyu)
Fixes: 7598e8700e9a ("drm/i915/gvt: Missed to cancel dma map for ggtt entries") Cc: stable@vger.kernel.org # v4.20+ Cc: Zhenyu Wang zhenyuw@linux.intel.com Reviewed-by: Zhenyu Wang zhenyuw@linux.intel.com Signed-off-by: Tina Zhang tina.zhang@intel.com Signed-off-by: Zhenyu Wang zhenyuw@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/i915/gvt/gtt.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/gvt/gtt.c +++ b/drivers/gpu/drm/i915/gvt/gtt.c @@ -2178,7 +2178,8 @@ static int emulate_ggtt_mmio_write(struc struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops; unsigned long g_gtt_index = off >> info->gtt_entry_size_shift; unsigned long gma, gfn; - struct intel_gvt_gtt_entry e, m; + struct intel_gvt_gtt_entry e = {.val64 = 0, .type = GTT_TYPE_GGTT_PTE}; + struct intel_gvt_gtt_entry m = {.val64 = 0, .type = GTT_TYPE_GGTT_PTE}; dma_addr_t dma_addr; int ret; struct intel_gvt_partial_pte *partial_pte, *pos, *n; @@ -2245,7 +2246,8 @@ static int emulate_ggtt_mmio_write(struc
if (!partial_update && (ops->test_present(&e))) { gfn = ops->get_pfn(&e); - m = e; + m.val64 = e.val64; + m.type = e.type;
/* one PTE update may be issued in multiple writes and the * first write may not construct a valid gfn