drivers/isdn/capi/kcapi.c: Adjust error handling code involving capi_ctr_put

After calling capi_ctr_get, error handling code should call capi_ctr_put.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r@
expression x,E;
statement S;
position p1,p2,p3;
@@

(
if ((x = capi_ctr_get@p1(...)) == NULL || ...) S
|
x = capi_ctr_get@p1(...)
... when != x
if (x == NULL || ...) S
)
<...
if@p3 (...) { ... when != capi_ctr_put(x)
                  when != if (x) { ... capi_ctr_put(x); ...}
    return@p2 ...;
}
...>
(
return x;
|
return 0;
|
x = E
|
E = x
|
capi_ctr_put(x)
)

@exists@
position r.p1,r.p2,r.p3;
expression x;
int ret != 0;
statement S;
@@

* x = capi_ctr_get@p1(...)
  <...
* if@p3 (...)
  S
  ...>
* return@p2 \(NULL\|ret\);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index 75726ea0fbbd1615705f68ab58bb914df386cf97..5360c4fd473915c8ad79bbd80de870b321c3f7f9 100644 (file)
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -828,15 +828,18 @@ static int old_capi_manufacturer(unsigned int cmd, void __user *data)
                        return -ESRCH;
                if (card->load_firmware == NULL) {
                        printk(KERN_DEBUG "kcapi: load: no load function\n");
+                       capi_ctr_put(card);
                        return -ESRCH;
                }
 
                if (ldef.t4file.len <= 0) {
                        printk(KERN_DEBUG "kcapi: load: invalid parameter: length of t4file is %d ?\n", ldef.t4file.len);
+                       capi_ctr_put(card);
                        return -EINVAL;
                }
                if (ldef.t4file.data == NULL) {
                        printk(KERN_DEBUG "kcapi: load: invalid parameter: dataptr is 0\n");
+                       capi_ctr_put(card);
                        return -EINVAL;
                }
 
@@ -849,6 +852,7 @@ static int old_capi_manufacturer(unsigned int cmd, void __user *data)
 
                if (card->cardstate != CARD_DETECTED) {
                        printk(KERN_INFO "kcapi: load: contr=%d not in detect state\n", ldef.contr);
+                       capi_ctr_put(card);
                        return -EBUSY;
                }
                card->cardstate = CARD_LOADING;