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Thu, 01 Oct 2026 00:58:48 -0700 (PDT) Received: from yocto.amd.com ([165.204.156.251]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-34db4d1d560sm5174829eec.29.2026.10.01.00.58.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Oct 2026 00:58:47 -0700 (PDT) From: paritoshpotukuchi@gmail.com To: linux-usb@vger.kernel.org Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, syzbot+debc5c305403f180c01c@syzkaller.appspotmail.com, Paritosh Potukuchi Subject: [PATCH] usb: gadget: f_uac1: fix ac_header_desc in descriptor lists Date: Thu, 1 Oct 2026 07:58:08 +0000 Message-ID: <20261001075808.2156188-1-paritoshpotukuchi@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Paritosh Potukuchi ac_header_desc is a pointer to a dynamically allocated uac1_ac_header_descriptor. The descriptor lists incorrectly store &ac_header_desc, which is the address of the pointer variable rather than the descriptor itself. usb_copy_descriptors() interprets entries in these lists as USB descriptor headers. As a result, passing &ac_header_desc causes the pointer variable itself to be interpreted as a descriptor and can lead to out-of-bounds memory accesses. Store ac_header_desc instead of &ac_header_desc in both f_audio_desc and f_audio_ss_desc. Fixes: 0591bc236015 ("usb: gadget: add f_uac1 variant based on a new u_audio 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 | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c index 7a81cd176abd..94cc90389f6a 100644 --- a/drivers/usb/gadget/function/f_uac1.c +++ b/drivers/usb/gadget/function/f_uac1.c @@ -260,7 +260,7 @@ static struct uac_iso_endpoint_descriptor as_iso_in_desc = { static struct usb_descriptor_header *f_audio_desc[] = { (struct usb_descriptor_header *)&ac_interface_desc, - (struct usb_descriptor_header *)&ac_header_desc, + (struct usb_descriptor_header *)ac_header_desc, (struct usb_descriptor_header *)&usb_out_it_desc, (struct usb_descriptor_header *)&io_out_ot_desc, @@ -332,7 +332,7 @@ static struct usb_ss_ep_comp_descriptor ss_as_in_ep_desc_comp = { static struct usb_descriptor_header *f_audio_ss_desc[] = { (struct usb_descriptor_header *)&ac_interface_desc, - (struct usb_descriptor_header *)&ac_header_desc, + (struct usb_descriptor_header *)ac_header_desc, (struct usb_descriptor_header *)&usb_out_it_desc, (struct usb_descriptor_header *)&io_out_ot_desc, -- 2.55.0