diff options
| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2021-04-08 12:31:20 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-04-09 13:19:38 +0200 |
| commit | 4f4e6644cd876c844cdb3bea2dd7051787d5ae25 (patch) | |
| tree | a938682e10b0496eac7d6c63e7a34c24f3b73fbe /drivers/media | |
| parent | 98965af1ebc3a652a597cee902f462f496ef9e11 (diff) | |
| download | linux-4f4e6644cd876c844cdb3bea2dd7051787d5ae25.tar.gz | |
media: gscpa/stv06xx: fix memory leak
For two of the supported sensors the stv06xx driver allocates memory which
is stored in sd->sensor_priv. This memory is freed on a disconnect, but if
the probe() fails, then it isn't freed and so this leaks memory.
Add a new probe_error() op that drivers can use to free any allocated
memory in case there was a probe failure.
Thanks to Pavel Skripkin <paskripkin@gmail.com> for discovering the cause
of the memory leak.
Reported-and-tested-by: syzbot+e7f4c64a4248a0340c37@syzkaller.appspotmail.com
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/usb/gspca/gspca.c | 2 | ||||
| -rw-r--r-- | drivers/media/usb/gspca/gspca.h | 1 | ||||
| -rw-r--r-- | drivers/media/usb/gspca/stv06xx/stv06xx.c | 9 |
3 files changed, 12 insertions, 0 deletions
diff --git a/drivers/media/usb/gspca/gspca.c b/drivers/media/usb/gspca/gspca.c index 158c8e28ed2c..47d8f28bfdfc 100644 --- a/drivers/media/usb/gspca/gspca.c +++ b/drivers/media/usb/gspca/gspca.c @@ -1576,6 +1576,8 @@ out: #endif v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); v4l2_device_unregister(&gspca_dev->v4l2_dev); + if (sd_desc->probe_error) + sd_desc->probe_error(gspca_dev); kfree(gspca_dev->usb_buf); kfree(gspca_dev); return ret; diff --git a/drivers/media/usb/gspca/gspca.h b/drivers/media/usb/gspca/gspca.h index b0ced2e14006..a6554d5e9e1a 100644 --- a/drivers/media/usb/gspca/gspca.h +++ b/drivers/media/usb/gspca/gspca.h @@ -105,6 +105,7 @@ struct sd_desc { cam_cf_op config; /* called on probe */ cam_op init; /* called on probe and resume */ cam_op init_controls; /* called on probe */ + cam_v_op probe_error; /* called if probe failed, do cleanup here */ cam_op start; /* called on stream on after URBs creation */ cam_pkt_op pkt_scan; /* optional operations */ diff --git a/drivers/media/usb/gspca/stv06xx/stv06xx.c b/drivers/media/usb/gspca/stv06xx/stv06xx.c index 95673fc0a99c..d9bc2aacc885 100644 --- a/drivers/media/usb/gspca/stv06xx/stv06xx.c +++ b/drivers/media/usb/gspca/stv06xx/stv06xx.c @@ -529,12 +529,21 @@ static int sd_int_pkt_scan(struct gspca_dev *gspca_dev, static int stv06xx_config(struct gspca_dev *gspca_dev, const struct usb_device_id *id); +static void stv06xx_probe_error(struct gspca_dev *gspca_dev) +{ + struct sd *sd = (struct sd *)gspca_dev; + + kfree(sd->sensor_priv); + sd->sensor_priv = NULL; +} + /* sub-driver description */ static const struct sd_desc sd_desc = { .name = MODULE_NAME, .config = stv06xx_config, .init = stv06xx_init, .init_controls = stv06xx_init_controls, + .probe_error = stv06xx_probe_error, .start = stv06xx_start, .stopN = stv06xx_stopN, .pkt_scan = stv06xx_pkt_scan, |