linux-kernel - [PATCH] drm/syncobj: Prevent overflow and large kmalloc in array

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Message-ID: <20251127130500.84415-1-madhurkumar004@gmail.com>
Date: Thu, 27 Nov 2025 18:35:00 +0530
From: Madhur Kumar <madhurkumar004@...il.com>
To: syzbot+95416f957d84e858b377@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com,
	linux-kernel@...r.kernel.org
Cc: Madhur Kumar <madhurkumar004@...il.com>
Subject: [PATCH] drm/syncobj: Prevent overflow and large kmalloc in array_find()

#syz test

Signed-off-by: Madhur Kumar <madhurkumar004@...il.com>
---
 drivers/gpu/drm/drm_syncobj.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index e1b0fa4000cd..f322b38ec251 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1293,6 +1293,13 @@ static int drm_syncobj_array_find(struct drm_file *file_private,
 	uint32_t i, *handles;
 	struct drm_syncobj **syncobjs;
 	int ret;
+	size_t size;
+
+	if (check_mul_overflow(count_handles, sizeof(*handles), &size))
+		return -EOVERFLOW;
+
+	if (size > KMALLOC_MAX_SIZE)
+		return -ERANGE;
 
 	handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL);
 	if (handles == NULL)
-- 
2.52.0