All of lore.kernel.org
 help / color / mirror / Atom feed
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>,
	linux390@de.ibm.com, Gleb Natapov <gleb@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	linux-s390@vger.kernel.org, kvm@vger.kernel.org,
	kernel-janitors@vger.kernel.org
Subject: [patch] KVM: s390: return -EFAULT if copy_from_user() fails
Date: Sat, 03 May 2014 20:18:11 +0000	[thread overview]
Message-ID: <20140503201811.GA32753@mwanda> (raw)

When copy_from_user() fails, this code returns the number of bytes
remaining instead of a negative error code.  The positive number is
returned to the user but otherwise it is harmless.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
I am not able to compile this.

diff --git a/arch/s390/kvm/guestdbg.c b/arch/s390/kvm/guestdbg.c
index 757ccef..3e8d409 100644
--- a/arch/s390/kvm/guestdbg.c
+++ b/arch/s390/kvm/guestdbg.c
@@ -223,9 +223,10 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 		goto error;
 	}
 
-	ret = copy_from_user(bp_data, dbg->arch.hw_bp, size);
-	if (ret)
+	if (copy_from_user(bp_data, dbg->arch.hw_bp, size)) {
+		ret = -EFAULT;
 		goto error;
+	}
 
 	for (i = 0; i < dbg->arch.nr_hw_bp; i++) {
 		switch (bp_data[i].type) {

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>,
	linux390@de.ibm.com, Gleb Natapov <gleb@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	linux-s390@vger.kernel.org, kvm@vger.kernel.org,
	kernel-janitors@vger.kernel.org
Subject: [patch] KVM: s390: return -EFAULT if copy_from_user() fails
Date: Sat, 3 May 2014 23:18:11 +0300	[thread overview]
Message-ID: <20140503201811.GA32753@mwanda> (raw)

When copy_from_user() fails, this code returns the number of bytes
remaining instead of a negative error code.  The positive number is
returned to the user but otherwise it is harmless.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
I am not able to compile this.

diff --git a/arch/s390/kvm/guestdbg.c b/arch/s390/kvm/guestdbg.c
index 757ccef..3e8d409 100644
--- a/arch/s390/kvm/guestdbg.c
+++ b/arch/s390/kvm/guestdbg.c
@@ -223,9 +223,10 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
 		goto error;
 	}
 
-	ret = copy_from_user(bp_data, dbg->arch.hw_bp, size);
-	if (ret)
+	if (copy_from_user(bp_data, dbg->arch.hw_bp, size)) {
+		ret = -EFAULT;
 		goto error;
+	}
 
 	for (i = 0; i < dbg->arch.nr_hw_bp; i++) {
 		switch (bp_data[i].type) {

             reply	other threads:[~2014-05-03 20:18 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-03 20:18 Dan Carpenter [this message]
2014-05-03 20:18 ` [patch] KVM: s390: return -EFAULT if copy_from_user() fails Dan Carpenter
2014-05-05  7:30 ` Christian Borntraeger
2014-05-05  7:30   ` Christian Borntraeger

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20140503201811.GA32753@mwanda \
    --to=dan.carpenter@oracle.com \
    --cc=borntraeger@de.ibm.com \
    --cc=cornelia.huck@de.ibm.com \
    --cc=gleb@kernel.org \
    --cc=heiko.carstens@de.ibm.com \
    --cc=kernel-janitors@vger.kernel.org \
    --cc=kvm@vger.kernel.org \
    --cc=linux-s390@vger.kernel.org \
    --cc=linux390@de.ibm.com \
    --cc=pbonzini@redhat.com \
    --cc=schwidefsky@de.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.