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authorArnd Bergmann <arnd@arndb.de>2021-06-14 12:34:09 +0200
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2021-06-17 10:18:37 +0200
commit0a7790be182d32b9b332a37cb4206e24fe94b728 (patch)
tree0af9820ab8c7f6c58afe4e4de4da2335496176ad /drivers/media
parentb4c650f1af68251f1970aecfc3c2fceec1552da2 (diff)
media: subdev: disallow ioctl for saa6588/davinci
The saa6588_ioctl() function expects to get called from other kernel functions with a 'saa6588_command' pointer, but I found nothing stops it from getting called from user space instead, which seems rather dangerous. The same thing happens in the davinci vpbe driver with its VENC_GET_FLD command. As a quick fix, add a separate .command() callback pointer for this driver and change the two callers over to that. This change can easily get backported to stable kernels if necessary, but since there are only two drivers, we may want to eventually replace this with a set of more specialized callbacks in the long run. Fixes: c3fda7f835b0 ("V4L/DVB (10537): saa6588: convert to v4l2_subdev.") Cc: stable@vger.kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.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/i2c/saa6588.c4
-rw-r--r--drivers/media/pci/bt8xx/bttv-driver.c6
-rw-r--r--drivers/media/pci/saa7134/saa7134-video.c6
-rw-r--r--drivers/media/platform/davinci/vpbe_display.c2
-rw-r--r--drivers/media/platform/davinci/vpbe_venc.c6
5 files changed, 11 insertions, 13 deletions
diff --git a/drivers/media/i2c/saa6588.c b/drivers/media/i2c/saa6588.c
index ecb491d5f2ab..d1e0716bdfff 100644
--- a/drivers/media/i2c/saa6588.c
+++ b/drivers/media/i2c/saa6588.c
@@ -380,7 +380,7 @@ static void saa6588_configure(struct saa6588 *s)
/* ---------------------------------------------------------------------- */
-static long saa6588_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
+static long saa6588_command(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{
struct saa6588 *s = to_saa6588(sd);
struct saa6588_command *a = arg;
@@ -433,7 +433,7 @@ static int saa6588_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_core_ops saa6588_core_ops = {
- .ioctl = saa6588_ioctl,
+ .command = saa6588_command,
};
static const struct v4l2_subdev_tuner_ops saa6588_tuner_ops = {
diff --git a/drivers/media/pci/bt8xx/bttv-driver.c b/drivers/media/pci/bt8xx/bttv-driver.c
index 1f62a9d8ea1d..0e9df8b35ac6 100644
--- a/drivers/media/pci/bt8xx/bttv-driver.c
+++ b/drivers/media/pci/bt8xx/bttv-driver.c
@@ -3179,7 +3179,7 @@ static int radio_release(struct file *file)
btv->radio_user--;
- bttv_call_all(btv, core, ioctl, SAA6588_CMD_CLOSE, &cmd);
+ bttv_call_all(btv, core, command, SAA6588_CMD_CLOSE, &cmd);
if (btv->radio_user == 0)
btv->has_radio_tuner = 0;
@@ -3260,7 +3260,7 @@ static ssize_t radio_read(struct file *file, char __user *data,
cmd.result = -ENODEV;
radio_enable(btv);
- bttv_call_all(btv, core, ioctl, SAA6588_CMD_READ, &cmd);
+ bttv_call_all(btv, core, command, SAA6588_CMD_READ, &cmd);
return cmd.result;
}
@@ -3281,7 +3281,7 @@ static __poll_t radio_poll(struct file *file, poll_table *wait)
cmd.instance = file;
cmd.event_list = wait;
cmd.poll_mask = res;
- bttv_call_all(btv, core, ioctl, SAA6588_CMD_POLL, &cmd);
+ bttv_call_all(btv, core, command, SAA6588_CMD_POLL, &cmd);
return cmd.poll_mask;
}
diff --git a/drivers/media/pci/saa7134/saa7134-video.c b/drivers/media/pci/saa7134/saa7134-video.c
index 0f9d6b9edb90..374c8e1087de 100644
--- a/drivers/media/pci/saa7134/saa7134-video.c
+++ b/drivers/media/pci/saa7134/saa7134-video.c
@@ -1181,7 +1181,7 @@ static int video_release(struct file *file)
saa_call_all(dev, tuner, standby);
if (vdev->vfl_type == VFL_TYPE_RADIO)
- saa_call_all(dev, core, ioctl, SAA6588_CMD_CLOSE, &cmd);
+ saa_call_all(dev, core, command, SAA6588_CMD_CLOSE, &cmd);
mutex_unlock(&dev->lock);
return 0;
@@ -1200,7 +1200,7 @@ static ssize_t radio_read(struct file *file, char __user *data,
cmd.result = -ENODEV;
mutex_lock(&dev->lock);
- saa_call_all(dev, core, ioctl, SAA6588_CMD_READ, &cmd);
+ saa_call_all(dev, core, command, SAA6588_CMD_READ, &cmd);
mutex_unlock(&dev->lock);
return cmd.result;
@@ -1216,7 +1216,7 @@ static __poll_t radio_poll(struct file *file, poll_table *wait)
cmd.event_list = wait;
cmd.poll_mask = 0;
mutex_lock(&dev->lock);
- saa_call_all(dev, core, ioctl, SAA6588_CMD_POLL, &cmd);
+ saa_call_all(dev, core, command, SAA6588_CMD_POLL, &cmd);
mutex_unlock(&dev->lock);
return rc | cmd.poll_mask;
diff --git a/drivers/media/platform/davinci/vpbe_display.c b/drivers/media/platform/davinci/vpbe_display.c
index d19bad997f30..bf3c3e76b921 100644
--- a/drivers/media/platform/davinci/vpbe_display.c
+++ b/drivers/media/platform/davinci/vpbe_display.c
@@ -47,7 +47,7 @@ static int venc_is_second_field(struct vpbe_display *disp_dev)
ret = v4l2_subdev_call(vpbe_dev->venc,
core,
- ioctl,
+ command,
VENC_GET_FLD,
&val);
if (ret < 0) {
diff --git a/drivers/media/platform/davinci/vpbe_venc.c b/drivers/media/platform/davinci/vpbe_venc.c
index 8caa084e5704..bde241c26d79 100644
--- a/drivers/media/platform/davinci/vpbe_venc.c
+++ b/drivers/media/platform/davinci/vpbe_venc.c
@@ -521,9 +521,7 @@ static int venc_s_routing(struct v4l2_subdev *sd, u32 input, u32 output,
return ret;
}
-static long venc_ioctl(struct v4l2_subdev *sd,
- unsigned int cmd,
- void *arg)
+static long venc_command(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{
u32 val;
@@ -542,7 +540,7 @@ static long venc_ioctl(struct v4l2_subdev *sd,
}
static const struct v4l2_subdev_core_ops venc_core_ops = {
- .ioctl = venc_ioctl,
+ .command = venc_command,
};
static const struct v4l2_subdev_video_ops venc_video_ops = {