V4L/DVB (8071): tda10023: Fix possible kernel oops during initialisation

If the i2c write fails during initialisation, an oops happens
because state->frontend.dvb is still undefined. Fixed.

Thanks to Sigmund Augdal for reporting this bug,
and to Hartmut Birr for suggesting the fix.

Thanks-to: Sigmund Augdal <sigmund@snap.tv>
Thanks-to: Hartmut Birr <e9hack@gmail.com>

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 12 insertions, 8 deletions

diff --git a/drivers/media/dvb/frontends/tda10023.c b/drivers/media/dvb/frontends/tda10023.c
index 0727b80bc4d2..c6ff5b82ff80 100644
--- a/drivers/media/dvb/frontends/tda10023.c
+++ b/drivers/media/dvb/frontends/tda10023.c
@@ -116,9 +116,12 @@ static u8 tda10023_readreg (struct tda10023_state* state, u8 reg)
         int ret;
 
         ret = i2c_transfer (state->i2c, msg, 2);
-        if (ret != 2)
-                printk("DVB: TDA10023: %s: readreg error (ret == %i)\n",
-                                 __func__, ret);
+        if (ret != 2) {
+                int num = state->frontend.dvb ? state->frontend.dvb->num : -1;
+                printk(KERN_ERR "DVB: TDA10023(%d): %s: readreg error "
+                        "(reg == 0x%02x, ret == %i)\n",
+                        num, __func__, reg, ret);
+        }
         return b1[0];
 }
 
@@ -129,11 +132,12 @@ static int tda10023_writereg (struct tda10023_state* state, u8 reg, u8 data)
         int ret;
 
         ret = i2c_transfer (state->i2c, &msg, 1);
-        if (ret != 1)
-                printk("DVB: TDA10023(%d): %s, writereg error "
+        if (ret != 1) {
+                int num = state->frontend.dvb ? state->frontend.dvb->num : -1;
+                printk(KERN_ERR "DVB: TDA10023(%d): %s, writereg error "
                         "(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
-                        state->frontend.dvb->num, __func__, reg, data, ret);
-
+                        num, __func__, reg, data, ret);
+        }
         return (ret != 1) ? -EREMOTEIO : 0;
 }
 
@@ -464,7 +468,7 @@ struct dvb_frontend* tda10023_attach(const struct tda1002x_config* config,
         int i;
 
         /* allocate memory for the internal state */
-        state = kmalloc(sizeof(struct tda10023_state), GFP_KERNEL);
+        state = kzalloc(sizeof(struct tda10023_state), GFP_KERNEL);
         if (state == NULL) goto error;
 
         /* setup the state */