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Thu, 27 Nov 2025 05:05:12 -0800 (PST) Received: from archlinux ([2409:40d6:115a:9b42:5333:be07:7e9e:384a]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29bceb471c6sm17588685ad.79.2025.11.27.05.05.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Nov 2025 05:05:12 -0800 (PST) From: Madhur Kumar To: syzbot+95416f957d84e858b377@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org Cc: Madhur Kumar Subject: [PATCH] drm/syncobj: Prevent overflow and large kmalloc in array_find() Date: Thu, 27 Nov 2025 18:35:00 +0530 Message-ID: <20251127130500.84415-1-madhurkumar004@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" #syz test Signed-off-by: Madhur Kumar Reported-by: syzbot+95416f957d84e858b377@syzkaller.appspotmail.com Tested-by: syzbot+95416f957d84e858b377@syzkaller.appspotmail.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 *f= ile_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; =20 handles =3D kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL); if (handles =3D=3D NULL) --=20 2.52.0