The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From ffeaf9aaf97b4bdaf114d6df52f800d71918768c Mon Sep 17 00:00:00 2001 From: fred gao <fred.gao@xxxxxxxxx> Date: Wed, 16 Aug 2017 15:48:03 +0800 Subject: [PATCH] drm/i915/gvt: Fix the kernel null pointer error once error happens in shadow_indirect_ctx function, the variable wa_ctx->indirect_ctx.obj is not initialized but accessed, so the kernel null point panic occurs. Fixes: 894cf7d15634 ("drm/i915/gvt: i915_gem_object_create() returns an error pointer") Cc: stable@xxxxxxxxxxxxxxx # v4.8+ Signed-off-by: fred gao <fred.gao@xxxxxxxxx> Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx> diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c index 713848c36349..e556a46cd4c2 100644 --- a/drivers/gpu/drm/i915/gvt/cmd_parser.c +++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c @@ -2714,7 +2714,7 @@ static int shadow_indirect_ctx(struct intel_shadow_wa_ctx *wa_ctx) unmap_src: i915_gem_object_unpin_map(obj); put_obj: - i915_gem_object_put(wa_ctx->indirect_ctx.obj); + i915_gem_object_put(obj); return ret; }