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author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2021-04-08 12:31:20 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-22 10:59:18 +0200 |
commit | a30d538ca26d8dc5a685351a01842ab839088e14 (patch) | |
tree | 1e286d0ddd4944088b74b19b9d1da85fbb120d28 | |
parent | 821b08dad8744b02b86d1b12ef8f74982f37a35e (diff) | |
download | linux-stable-a30d538ca26d8dc5a685351a01842ab839088e14.tar.gz linux-stable-a30d538ca26d8dc5a685351a01842ab839088e14.tar.bz2 linux-stable-a30d538ca26d8dc5a685351a01842ab839088e14.zip |
media: gscpa/stv06xx: fix memory leak
[ Upstream commit 4f4e6644cd876c844cdb3bea2dd7051787d5ae25 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-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 93212ed80bf8..f0562b8eef56 100644 --- a/drivers/media/usb/gspca/gspca.c +++ b/drivers/media/usb/gspca/gspca.c @@ -1586,6 +1586,8 @@ 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 b7ea4f982964..ccec6138f678 100644 --- a/drivers/media/usb/gspca/stv06xx/stv06xx.c +++ b/drivers/media/usb/gspca/stv06xx/stv06xx.c @@ -538,12 +538,21 @@ 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, |