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Mon, 03 Aug 2026 20:44:05 -0700 (PDT) Received: from Default ([157.51.13.203]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13fab132cc4sm36025019c88.2.2026.08.03.20.43.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 20:44:04 -0700 (PDT) From: Jeffin Philip To: gregkh@linuxfoundation.org Cc: xu.yang_2@nxp.com, Frank.Li@nxp.com, kees@kernel.org, panjunzhong@linux.spacemit.com, andrzej.p@samsung.com, laurent.pinchart@ideasonboard.com, balbi@ti.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffin Philip , syzbot+8dcac923582c28505fd7@syzkaller.appspotmail.com, stable@vger.kernel.org Subject: [PATCH v7] usb: gadget: uvc: Fix null pointer dereference in uvcg_video_init() Date: Tue, 4 Aug 2026 09:13:38 +0530 Message-ID: <20260804034338.7976-1-jeffinphilip14@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: quoted-printable Content-Type: text/plain; charset="utf-8" In uvcg_video_init(), if kthread_run_worker() fails, the error logged uses uvcg_err(), however, the pointer it uses: video->uvc is not assigned at this point, triggering a null pointer dereference. Fix this by directly using uvc->func which is assigned already. Reported-by: syzbot+8dcac923582c28505fd7@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D8dcac923582c28505fd7 Fixes: f0bbfbd16b3b ("usb: gadget: uvc: rework to enqueue in pump worker fr= om encoded queue") Cc: stable@vger.kernel.org Signed-off-by: Jeffin Philip Reviewed-by: Xu Yang --- Changes in v7: Changed Fixes: tag hash mentioned incorrectly to be updated before in v4 =20 Changes in v6: No code changes from v5 =20 Changes in v5: Added changelog as per maintainer suggestions =20 Changes in v4: Changed Fixes commit line as per Xu Yang's suggestion =20 Changes in v3: Shortened SHA1 hash as per maintainer comment =20 Changes in v2: -Changed subject of the patch to include subsystem as per Xu Yang's comment -Changed incorrect "Fixes" tag to "Closes" -Rewrote the patch to use uvc->func rather than declaring video->uvc first as per Xu Yang's comment --- drivers/usb/gadget/function/uvc_video.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/f= unction/uvc_video.c index 2f9700b3f1b6..9ba09118bb74 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -821,7 +821,7 @@ int uvcg_video_init(struct uvc_video *video, struct uvc= _device *uvc) /* Allocate a kthread for asynchronous hw submit handler. */ video->kworker =3D kthread_run_worker(0, "UVCG"); if (IS_ERR(video->kworker)) { - uvcg_err(&video->uvc->func, "failed to create UVCG kworker\n"); + uvcg_err(&uvc->func, "failed to create UVCG kworker\n"); return PTR_ERR(video->kworker); } =20 --=20 2.55.0