linux-kernel - [PATCH] drm/xe/svm: fix dereferencing error pointer in drm_gpusvm_range

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Message-ID: <20250323124907.3946370-1-harshit.m.mogalapalli@oracle.com>
Date: Sun, 23 Mar 2025 05:49:06 -0700
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: Lucas De Marchi <lucas.demarchi@...el.com>,
        Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Matthew Brost <matthew.brost@...el.com>,
        intel-xe@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc: dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com, harshit.m.mogalapalli@...cle.com
Subject: [PATCH] drm/xe/svm: fix dereferencing error pointer in drm_gpusvm_range_alloc()

xe_svm_range_alloc() returns ERR_PTR(-ENOMEM) on failure and there is a
dereference of "range" after that:

	-->     range->gpusvm = gpusvm;

In xe_svm_range_alloc(), when memory allocation fails return NULL
instead to handle this situation.

Fixes: 99624bdff867 ("drm/gpusvm: Add support for GPU Shared Virtual Memory")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/all/adaef4dd-5866-48ca-bc22-4a1ddef20381@stanley.mountain/
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
This is based on static analysis and only compile tested.
---
 drivers/gpu/drm/xe/xe_svm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 52e04e7e343f..a79df8cf1f36 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -80,7 +80,7 @@ xe_svm_range_alloc(struct drm_gpusvm *gpusvm)
 
 	range = kzalloc(sizeof(*range), GFP_KERNEL);
 	if (!range)
-		return ERR_PTR(-ENOMEM);
+		return NULL;
 
 	INIT_LIST_HEAD(&range->garbage_collector_link);
 	xe_vm_get(gpusvm_to_vm(gpusvm));
-- 
2.39.3