linux-kernel - [PATCH] drm/imagination: vm: Fix heap lookup condition

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Date:   Fri,  8 Dec 2023 18:08:56 +0100
From:   Alex Bee <knaerzche@...il.com>
To:     Frank Binns <frank.binns@...tec.com>,
        Donald Robson <donald.robson@...tec.com>,
        Matt Coster <matt.coster@...tec.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Sarah Walker <sarah.walker@...tec.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Alex Bee <knaerzche@...il.com>
Subject: [PATCH] drm/imagination: vm: Fix heap lookup condition

When conditionally checking for heap existence of a certian address in
pvr_vm_bind_op_map_init the condition whether the map request comes from a
user is incorrect: The context must not be the kernel-context to be a
user(space) context and should be looked up in pvr_heaps.

That makes addresses coming from userspace not being verfied against the
defined ranges and prevents firmware loading for meta cores.

Fixes: ff5f643de0bf ("drm/imagination: Add GEM and VM related code")
Signed-off-by: Alex Bee <knaerzche@...il.com>
---
 drivers/gpu/drm/imagination/pvr_vm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/imagination/pvr_vm.c b/drivers/gpu/drm/imagination/pvr_vm.c
index f42345fbe4bf..82690cee978c 100644
--- a/drivers/gpu/drm/imagination/pvr_vm.c
+++ b/drivers/gpu/drm/imagination/pvr_vm.c
@@ -225,7 +225,7 @@ pvr_vm_bind_op_map_init(struct pvr_vm_bind_op *bind_op,
 			u64 device_addr, u64 size)
 {
 	struct drm_gem_object *obj = gem_from_pvr_gem(pvr_obj);
-	const bool is_user = vm_ctx == vm_ctx->pvr_dev->kernel_vm_ctx;
+	const bool is_user = vm_ctx != vm_ctx->pvr_dev->kernel_vm_ctx;
 	const u64 pvr_obj_size = pvr_gem_object_size(pvr_obj);
 	struct sg_table *sgt;
 	u64 offset_plus_size;
-- 
2.43.0