From: Madhur Kumar <madhurkumar004@gmail.com>
To: syzbot+95416f957d84e858b377@syzkaller.appspotmail.com,
syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org
Cc: Madhur Kumar <madhurkumar004@gmail.com>
Subject: [PATCH] drm/syncobj: Prevent overflow and large kmalloc in array_find()
Date: Thu, 27 Nov 2025 18:35:00 +0530 [thread overview]
Message-ID: <20251127130500.84415-1-madhurkumar004@gmail.com> (raw)
#syz test
Signed-off-by: Madhur Kumar <madhurkumar004@gmail.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
next reply other threads:[~2025-11-27 13:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-27 13:05 Madhur Kumar [this message]
2025-11-27 13:22 ` [syzbot] [dri?] WARNING in drm_syncobj_array_find syzbot
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