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Sat, 01 Aug 2026 14:08:42 -0700 (PDT) Received: from amd.com ([165.204.156.251]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3153e04491dsm28260781eec.16.2026.08.01.14.08.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 01 Aug 2026 14:08:42 -0700 (PDT) From: Paritosh Potukuchi X-Google-Original-From: Paritosh Potukuchi To: linux-usb@vger.kernel.org Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, Paritosh Potukuchi , syzbot+debc5c305403f180c01c@syzkaller.appspotmail.com Subject: [PATCH] usb: gadget: f_uac1: fix ac_header_desc in SS descriptor list Date: Sat, 1 Aug 2026 21:08:34 +0000 Message-ID: <20260801210834.3809187-1-paritosh.potukuchi@amd.com> X-Mailer: git-send-email 2.43.0 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" ac_header_desc is a pointer to a dynamically allocated uac1_ac_header_descriptor. The SS descriptor list incorrectly stores &ac_header_desc, which is the address of the pointer variable rather than the descriptor itself. usb_copy_descriptors() interprets the entry as a USB descriptor header, which can lead to a global-out-of-bounds read. Store ac_header_desc instead of &ac_header_desc. Fixes: 0591bc236015 ("usb: gadget: add f_uac1 variant based on a new u_audi= o api") Reported-by: syzbot+debc5c305403f180c01c@syzkaller.appspotmail.com Link: https://lore.kernel.org/all/6a68b182.4c659fcc.19cd90.0021.GAE@google.= com/T/ Signed-off-by: Paritosh Potukuchi --- drivers/usb/gadget/function/f_uac1.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/func= tion/f_uac1.c index 85c502e98f57..95d53ac8cedb 100644 --- a/drivers/usb/gadget/function/f_uac1.c +++ b/drivers/usb/gadget/function/f_uac1.c @@ -332,7 +332,7 @@ static struct usb_ss_ep_comp_descriptor ss_as_in_ep_des= c_comp =3D { =20 static struct usb_descriptor_header *f_audio_ss_desc[] =3D { (struct usb_descriptor_header *)&ac_interface_desc, - (struct usb_descriptor_header *)&ac_header_desc, + (struct usb_descriptor_header *)ac_header_desc, =20 (struct usb_descriptor_header *)&usb_out_it_desc, (struct usb_descriptor_header *)&io_out_ot_desc, --=20 2.54.0