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author | 2008-12-25 13:39:28 +0100 | |
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committer | 2008-12-25 13:39:16 +0100 | |
commit | 21e7b2c4d59e5d6631b25e71e777cb0160997d6a (patch) | |
tree | b7ec97726e6d16756da6104f5284ea98453c8f80 /drivers/s390/crypto/zcrypt_pcicc.c | |
parent | [S390] panic_stack leak in smp_alloc_lowcore (diff) | |
download | linux-dev-21e7b2c4d59e5d6631b25e71e777cb0160997d6a.tar.xz linux-dev-21e7b2c4d59e5d6631b25e71e777cb0160997d6a.zip |
[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>
Diffstat (limited to 'drivers/s390/crypto/zcrypt_pcicc.c')
-rw-r--r-- | drivers/s390/crypto/zcrypt_pcicc.c | 10 |
1 files changed, 7 insertions, 3 deletions
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); } |