5.0-stable review patch. If anyone has any objections, please let me know.
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From: Zhenyu Wang zhenyuw@linux.intel.com
commit 13bcb80b7ee79431fce361e060611134cb19e209 upstream.
When MI_FLUSH_DW post write hw status page in index mode, the index value is in dword step and turned into address offset in cmd dword1. As status page size is 4K, so can't exceed that.
This fixed upper bound check in cmd parser code which incorrectly stopped VM for reason of invalid MI_FLUSH_DW write index.
v2: - Fix upper bound as 4K page size because index value is address offset.
Fixes: be1da7070aea ("drm/i915/gvt: vGPU command scanner") Cc: stable@vger.kernel.org # v4.10+ Cc: "Zhao, Yan Y" yan.y.zhao@intel.com Reviewed-by: Yan Zhao yan.y.zhao@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/cmd_parser.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c +++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c @@ -1446,7 +1446,7 @@ static inline int cmd_address_audit(stru }
if (index_mode) { - if (guest_gma >= I915_GTT_PAGE_SIZE / sizeof(u64)) { + if (guest_gma >= I915_GTT_PAGE_SIZE) { ret = -EFAULT; goto err; }