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Fri, 26 Feb 2021 15:37:37 -0800 (PST) From: Pavel Skripkin To: hverkuil@xs4all.nl, mchehab@kernel.org, linux-media@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Pavel Skripkin , syzbot+e7f4c64a4248a0340c37@syzkaller.appspotmail.com Subject: [PATCH] drivers/media/usb/gspca/stv06xx: fix memory leak Date: Sat, 27 Feb 2021 02:37:31 +0300 Message-Id: <20210226233731.614553-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Syzbot reported memory leak in hdcs_probe_1x00()[1]. hdcs_probe_1x00() allocates memory for struct hdcs, but if hdcs_init() fails in gspca_dev_probe2() this memory becomes leaked. int gspca_dev_probe2(struct usb_interface *intf, const struct usb_device_id *id, const struct sd_desc *sd_desc, int dev_size, struct module *module) { ... ret = sd_desc->config(gspca_dev, id); if (ret < 0) goto out; ret = sd_desc->init(gspca_dev); if (ret < 0) goto out; ... out: if (gspca_dev->input_dev) input_unregister_device(gspca_dev->input_dev); v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); v4l2_device_unregister(&gspca_dev->v4l2_dev); kfree(gspca_dev->usb_buf); kfree(gspca_dev); return ret; } Reported-by: syzbot+e7f4c64a4248a0340c37@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin Change-Id: Ia198671177ee346de61780813025110c7c491d7a --- drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c b/drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c index 5a47dcbf1c8e..24df13b33a02 100644 --- a/drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c +++ b/drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c @@ -485,7 +485,7 @@ static int hdcs_init(struct sd *sd) stv_bridge_init[i][1]); } if (err < 0) - return err; + goto error; /* sensor soft reset */ hdcs_reset(sd); @@ -496,12 +496,12 @@ static int hdcs_init(struct sd *sd) stv_sensor_init[i][1]); } if (err < 0) - return err; + goto error; /* Enable continuous frame capture, bit 2: stop when frame complete */ err = stv06xx_write_sensor(sd, HDCS_REG_CONFIG(sd), BIT(3)); if (err < 0) - return err; + goto error; /* Set PGA sample duration (was 0x7E for the STV602, but caused slow framerate with HDCS-1020) */ @@ -512,9 +512,13 @@ static int hdcs_init(struct sd *sd) err = stv06xx_write_sensor(sd, HDCS_TCTRL, (HDCS_ADC_START_SIG_DUR << 5) | hdcs->psmp); if (err < 0) - return err; + goto error; return hdcs_set_size(sd, hdcs->array.width, hdcs->array.height); + +error: + kfree(hdcs); + return err; } static int hdcs_dump(struct sd *sd)