[S390] drivers/s390/crypto: Move dereference to after IS_ERR test

If reply is ERR_PTR(...), then it should not be dereferenced, so I have
moved the dereference from the declaration to after the IS_ERR test.

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

// <smpl>
@match exists@
expression x, E;
identifier fld;
position p1,p2;
@@

(
x = E;
|
x = E
|
x@p1->fld
... when != x = E
IS_ERR(x@p2)
... when any
)

@other_match exists@
expression match.x, E1, E2;
position match.p1,match.p2;
@@

x = E1
... when != x = E2
    when != x@p1
x@p2

@ script:python depends on !other_match@
p1 << match.p1;
p2 << match.p2;
@@

print "* file %s dereference %s test %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

4 files changed, 28 insertions, 12 deletions

diff --git a/drivers/s390/crypto/zcrypt_cex2a.c b/drivers/s390/crypto/zcrypt_cex2a.c
index 54f4cbc3be9e..326ea08f67c9 100644
--- a/drivers/s390/crypto/zcrypt_cex2a.c
+++ b/drivers/s390/crypto/zcrypt_cex2a.c
@@ -264,17 +264,21 @@ static void zcrypt_cex2a_receive(struct ap_device *ap_dev,
                 .type = TYPE82_RSP_CODE,
                 .reply_code = REP82_ERROR_MACHINE_FAILURE,
         };
-        struct type80_hdr *t80h = reply->message;
+        struct type80_hdr *t80h;
         int length;
 
         /* Copy the reply message to the request message buffer. */
-        if (IS_ERR(reply))
+        if (IS_ERR(reply)) {
                 memcpy(msg->message, &error_reply, sizeof(error_reply));
-        else if (t80h->type == TYPE80_RSP_CODE) {
+                goto out;
+        }
+        t80h = reply->message;
+        if (t80h->type == TYPE80_RSP_CODE) {
                 length = min(CEX2A_MAX_RESPONSE_SIZE, (int) t80h->len);
                 memcpy(msg->message, reply->message, length);
         } else
                 memcpy(msg->message, reply->message, sizeof error_reply);
+out:
         complete((struct completion *) msg->private);
 }
 
diff --git a/drivers/s390/crypto/zcrypt_pcica.c b/drivers/s390/crypto/zcrypt_pcica.c
index 12da4815ba8e..17ba81b58c78 100644
--- a/drivers/s390/crypto/zcrypt_pcica.c
+++ b/drivers/s390/crypto/zcrypt_pcica.c
@@ -247,17 +247,21 @@ static void zcrypt_pcica_receive(struct ap_device *ap_dev,
                 .type = TYPE82_RSP_CODE,
                 .reply_code = REP82_ERROR_MACHINE_FAILURE,
         };
-        struct type84_hdr *t84h = reply->message;
+        struct type84_hdr *t84h;
         int length;
 
         /* Copy the reply message to the request message buffer. */
-        if (IS_ERR(reply))
+        if (IS_ERR(reply)) {
                 memcpy(msg->message, &error_reply, sizeof(error_reply));
-        else if (t84h->code == TYPE84_RSP_CODE) {
+                goto out;
+        }
+        t84h = reply->message;
+        if (t84h->code == TYPE84_RSP_CODE) {
                 length = min(PCICA_MAX_RESPONSE_SIZE, (int) t84h->len);
                 memcpy(msg->message, reply->message, length);
         } else
                 memcpy(msg->message, reply->message, sizeof error_reply);
+out:
         complete((struct completion *) msg->private);
 }
 
diff --git a/drivers/s390/crypto/zcrypt_pcicc.c b/drivers/s390/crypto/zcrypt_pcicc.c
index 779952cb19fc..f4b0c4795434 100644
--- a/drivers/s390/crypto/zcrypt_pcicc.c
+++ b/drivers/s390/crypto/zcrypt_pcicc.c
@@ -447,19 +447,23 @@ static void zcrypt_pcicc_receive(struct ap_device *ap_dev,
                 .type = TYPE82_RSP_CODE,
                 .reply_code = REP82_ERROR_MACHINE_FAILURE,
         };
-        struct type86_reply *t86r = reply->message;
+        struct type86_reply *t86r;
         int length;
 
         /* Copy the reply message to the request message buffer. */
-        if (IS_ERR(reply))
+        if (IS_ERR(reply)) {
                 memcpy(msg->message, &error_reply, sizeof(error_reply));
-        else if (t86r->hdr.type == TYPE86_RSP_CODE &&
+                goto out;
+        }
+        t86r = reply->message;
+        if (t86r->hdr.type == TYPE86_RSP_CODE &&
                  t86r->cprb.cprb_ver_id == 0x01) {
                 length = sizeof(struct type86_reply) + t86r->length - 2;
                 length = min(PCICC_MAX_RESPONSE_SIZE, length);
                 memcpy(msg->message, reply->message, length);
         } else
                 memcpy(msg->message, reply->message, sizeof error_reply);
+out:
         complete((struct completion *) msg->private);
 }
 
diff --git a/drivers/s390/crypto/zcrypt_pcixcc.c b/drivers/s390/crypto/zcrypt_pcixcc.c
index d8ad36f81540..e7a1e22e77ac 100644
--- a/drivers/s390/crypto/zcrypt_pcixcc.c
+++ b/drivers/s390/crypto/zcrypt_pcixcc.c
@@ -635,13 +635,16 @@ static void zcrypt_pcixcc_receive(struct ap_device *ap_dev,
         };
         struct response_type *resp_type =
                 (struct response_type *) msg->private;
-        struct type86x_reply *t86r = reply->message;
+        struct type86x_reply *t86r;
         int length;
 
         /* Copy the reply message to the request message buffer. */
-        if (IS_ERR(reply))
+        if (IS_ERR(reply)) {
                 memcpy(msg->message, &error_reply, sizeof(error_reply));
-        else if (t86r->hdr.type == TYPE86_RSP_CODE &&
+                goto out;
+        }
+        t86r = reply->message;
+        if (t86r->hdr.type == TYPE86_RSP_CODE &&
                  t86r->cprbx.cprb_ver_id == 0x02) {
                 switch (resp_type->type) {
                 case PCIXCC_RESPONSE_TYPE_ICA:
@@ -660,6 +663,7 @@ static void zcrypt_pcixcc_receive(struct ap_device *ap_dev,
                 }
         } else
                 memcpy(msg->message, reply->message, sizeof error_reply);
+out:
         complete(&(resp_type->work));
 }