[PATCH AUTOSEL 6.11 31/32] drm/xe/ufence: Prefetch ufence addr to catch bogus address
Sasha Levin
sashal at kernel.org
Mon Oct 28 10:50:13 UTC 2024
From: Nirmoy Das <nirmoy.das at intel.com>
[ Upstream commit 9c1813b3253480b30604c680026c7dc721ce86d1 ]
access_ok() only checks for addr overflow so also try to read the addr
to catch invalid addr sent from userspace.
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1630
Cc: Francois Dugast <francois.dugast at intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Reviewed-by: Matthew Brost <matthew.brost at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016082304.66009-2-nirmoy.das@intel.com
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
(cherry picked from commit 9408c4508483ffc60811e910a93d6425b8e63928)
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
drivers/gpu/drm/xe/xe_sync.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/xe/xe_sync.c b/drivers/gpu/drm/xe/xe_sync.c
index de80c8b7c8913..9d77f2d4096f5 100644
--- a/drivers/gpu/drm/xe/xe_sync.c
+++ b/drivers/gpu/drm/xe/xe_sync.c
@@ -54,8 +54,9 @@ static struct xe_user_fence *user_fence_create(struct xe_device *xe, u64 addr,
{
struct xe_user_fence *ufence;
u64 __user *ptr = u64_to_user_ptr(addr);
+ u64 __maybe_unused prefetch_val;
- if (!access_ok(ptr, sizeof(*ptr)))
+ if (get_user(prefetch_val, ptr))
return ERR_PTR(-EFAULT);
ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);
--
2.43.0
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