[media] v4l: make sure drivers supply a zeroed struct v4l2_subdev

Some v4l drivers currently don't initialize their struct v4l2_subdev
with zeros, and this is a problem since some of the v4l2 code expects
this. One example is the addition of internal_ops in commit 45f6f84,
after that we are at risk of random oopses with these drivers when code
in v4l2_device_register_subdev tries to dereference sd->internal_ops->*,
as can be shown by the report at http://bugs.launchpad.net/bugs/745213
and analysis of its crash at https://lkml.org/lkml/2011/4/1/168

Use kzalloc within problematic drivers to ensure we have a zeroed struct
v4l2_subdev.

BugLink: http://bugs.launchpad.net/bugs/745213
Cc: <stable@kernel.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/radio/saa7706h.c b/drivers/media/radio/saa7706h.c
index 585680ffbfb64b121a4eb01eff27da0346660f6b..b1193dfc5087bb0ed2f5b24e09e9665107330c6f 100644 (file)
--- a/drivers/media/radio/saa7706h.c
+++ b/drivers/media/radio/saa7706h.c
@@ -376,7 +376,7 @@ static int __devinit saa7706h_probe(struct i2c_client *client,
        v4l_info(client, "chip found @ 0x%02x (%s)\n",
                        client->addr << 1, client->adapter->name);
 
-       state = kmalloc(sizeof(struct saa7706h_state), GFP_KERNEL);
+       state = kzalloc(sizeof(struct saa7706h_state), GFP_KERNEL);
        if (state == NULL)
                return -ENOMEM;
        sd = &state->sd;

diff --git a/drivers/media/radio/tef6862.c b/drivers/media/radio/tef6862.c
index 7c0d77751f6e66ba5d77a683fb1ba3890c0c4626..0991e1973678ce0751c455cb85249264935415fb 100644 (file)
--- a/drivers/media/radio/tef6862.c
+++ b/drivers/media/radio/tef6862.c
@@ -176,7 +176,7 @@ static int __devinit tef6862_probe(struct i2c_client *client,
        v4l_info(client, "chip found @ 0x%02x (%s)\n",
                        client->addr << 1, client->adapter->name);
 
-       state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL);
+       state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL);
        if (state == NULL)
                return -ENOMEM;
        state->freq = TEF6862_LO_FREQ;

diff --git a/drivers/media/video/m52790.c b/drivers/media/video/m52790.c
index 5e1c9a81984ca837955d2f67a895e5265bb37e6a..303ffa7df4aca521c617ed1629678deb91ea3606 100644 (file)
--- a/drivers/media/video/m52790.c
+++ b/drivers/media/video/m52790.c
@@ -174,7 +174,7 @@ static int m52790_probe(struct i2c_client *client,
        v4l_info(client, "chip found @ 0x%x (%s)\n",
                        client->addr << 1, client->adapter->name);
 
-       state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL);
+       state = kzalloc(sizeof(struct m52790_state), GFP_KERNEL);
        if (state == NULL)
                return -ENOMEM;
 

diff --git a/drivers/media/video/tda9840.c b/drivers/media/video/tda9840.c
index 5d4cf3b3d435076a2f8db0ff102aa1815894bbea..22fa8202d5ca314466c4c11d8f13c877777db454 100644 (file)
--- a/drivers/media/video/tda9840.c
+++ b/drivers/media/video/tda9840.c
@@ -171,7 +171,7 @@ static int tda9840_probe(struct i2c_client *client,
        v4l_info(client, "chip found @ 0x%x (%s)\n",
                        client->addr << 1, client->adapter->name);
 
-       sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
+       sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
        if (sd == NULL)
                return -ENOMEM;
        v4l2_i2c_subdev_init(sd, client, &tda9840_ops);

diff --git a/drivers/media/video/tea6415c.c b/drivers/media/video/tea6415c.c
index 19621ed523ec605c6f55945eb43c1cf19dd5febb..827425c5b866e9e895e8393a7d8e5c5c8ca98723 100644 (file)
--- a/drivers/media/video/tea6415c.c
+++ b/drivers/media/video/tea6415c.c
@@ -152,7 +152,7 @@ static int tea6415c_probe(struct i2c_client *client,
 
        v4l_info(client, "chip found @ 0x%x (%s)\n",
                        client->addr << 1, client->adapter->name);
-       sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
+       sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
        if (sd == NULL)
                return -ENOMEM;
        v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);

diff --git a/drivers/media/video/tea6420.c b/drivers/media/video/tea6420.c
index 5ea840401f21865120623691ecc0d20cc084decc..f350b6c24500110dbce1f064e24365dc5974fe7b 100644 (file)
--- a/drivers/media/video/tea6420.c
+++ b/drivers/media/video/tea6420.c
@@ -125,7 +125,7 @@ static int tea6420_probe(struct i2c_client *client,
        v4l_info(client, "chip found @ 0x%x (%s)\n",
                        client->addr << 1, client->adapter->name);
 
-       sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
+       sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
        if (sd == NULL)
                return -ENOMEM;
        v4l2_i2c_subdev_init(sd, client, &tea6420_ops);

diff --git a/drivers/media/video/upd64031a.c b/drivers/media/video/upd64031a.c
index f8138c75be8be3a25834ca4471da721b5163e5d1..1aab96a882034a41867641e3d1022a3643303dc2 100644 (file)
--- a/drivers/media/video/upd64031a.c
+++ b/drivers/media/video/upd64031a.c
@@ -230,7 +230,7 @@ static int upd64031a_probe(struct i2c_client *client,
        v4l_info(client, "chip found @ 0x%x (%s)\n",
                        client->addr << 1, client->adapter->name);
 
-       state = kmalloc(sizeof(struct upd64031a_state), GFP_KERNEL);
+       state = kzalloc(sizeof(struct upd64031a_state), GFP_KERNEL);
        if (state == NULL)
                return -ENOMEM;
        sd = &state->sd;

diff --git a/drivers/media/video/upd64083.c b/drivers/media/video/upd64083.c
index 28e0e6b6ca8491d815de9f822e19fae412b23ca6..9bbe61700fd5c238d253d309ea37a21a4f3ca6a1 100644 (file)
--- a/drivers/media/video/upd64083.c
+++ b/drivers/media/video/upd64083.c
@@ -202,7 +202,7 @@ static int upd64083_probe(struct i2c_client *client,
        v4l_info(client, "chip found @ 0x%x (%s)\n",
                        client->addr << 1, client->adapter->name);
 
-       state = kmalloc(sizeof(struct upd64083_state), GFP_KERNEL);
+       state = kzalloc(sizeof(struct upd64083_state), GFP_KERNEL);
        if (state == NULL)
                return -ENOMEM;
        sd = &state->sd;