linux-kernel - [PATCH] i915/gvt: Fix NULL pointer dereference in init_mmio_block

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Date:   Wed, 27 Apr 2022 19:54:56 +0800
From:   Wan Jiabing <wanjiabing@...o.com>
To:     Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     Wan Jiabing <wanjiabing@...o.com>
Subject: [PATCH] i915/gvt: Fix NULL pointer dereference in init_mmio_block_handlers

Fix following coccicheck error:
./drivers/gpu/drm/i915/gvt/handlers.c:2925:35-41: ERROR: block is NULL but dereferenced.

Use gvt->mmio.mmio_block instead of block to avoid NULL pointer
dereference when find_mmio_block returns NULL.

Fixes: e0f74ed4634d ("i915/gvt: Separate the MMIO tracking table from GVT-g")
Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
---
 drivers/gpu/drm/i915/gvt/handlers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index cf00398c2870..7ffe0fb512a9 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -2922,7 +2922,7 @@ static int init_mmio_block_handlers(struct intel_gvt *gvt)
 	block = find_mmio_block(gvt, VGT_PVINFO_PAGE);
 	if (!block) {
 		WARN(1, "fail to assign handlers to mmio block %x\n",
-		     i915_mmio_reg_offset(block->offset));
+		     i915_mmio_reg_offset(gvt->mmio.mmio_block->offset));
 		return -ENODEV;
 	}
 
-- 
2.35.3