From: Dan Carpenter <dan.carpenter@oracle.com> To: Alex Williamson <alex.williamson@redhat.com> Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [patch 1/3] vfio: signedness bug in vfio_config_do_rw() Date: Thu, 28 Jun 2012 09:44:25 +0300 [thread overview] Message-ID: <20120628064425.GA11107@elgon.mountain> (raw) In-Reply-To: <1340686552.1207.128.camel@bling.home> The "count" variable is unsigned here so the test for errors doesn't work. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c index a4f7321..10bc6a8 100644 --- a/drivers/vfio/pci/vfio_pci_config.c +++ b/drivers/vfio/pci/vfio_pci_config.c @@ -1487,7 +1487,7 @@ static ssize_t vfio_config_do_rw(struct vfio_pci_device *vdev, char __user *buf, if (perm->readfn) { count = perm->readfn(vdev, *ppos, count, perm, offset, &val); - if (count < 0) + if ((ssize_t)count < 0) return count; }
WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com> To: Alex Williamson <alex.williamson@redhat.com> Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [patch 1/3] vfio: signedness bug in vfio_config_do_rw() Date: Thu, 28 Jun 2012 06:44:25 +0000 [thread overview] Message-ID: <20120628064425.GA11107@elgon.mountain> (raw) In-Reply-To: <1340686552.1207.128.camel@bling.home> The "count" variable is unsigned here so the test for errors doesn't work. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c index a4f7321..10bc6a8 100644 --- a/drivers/vfio/pci/vfio_pci_config.c +++ b/drivers/vfio/pci/vfio_pci_config.c @@ -1487,7 +1487,7 @@ static ssize_t vfio_config_do_rw(struct vfio_pci_device *vdev, char __user *buf, if (perm->readfn) { count = perm->readfn(vdev, *ppos, count, perm, offset, &val); - if (count < 0) + if ((ssize_t)count < 0) return count; }
next prev parent reply other threads:[~2012-06-28 6:44 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-06-26 4:55 Request VFIO inclusion in linux-next Alex Williamson 2012-06-26 4:55 ` Alex Williamson 2012-06-26 21:17 ` Benjamin Herrenschmidt 2012-06-26 21:17 ` Benjamin Herrenschmidt 2012-06-26 23:50 ` Stephen Rothwell 2012-06-27 12:37 ` Dan Carpenter 2012-06-27 12:37 ` Dan Carpenter 2012-06-27 19:23 ` Alex Williamson 2012-06-27 19:23 ` Alex Williamson 2012-06-28 6:44 ` Dan Carpenter 2012-06-28 6:44 ` Dan Carpenter 2012-07-02 3:41 ` Alexey Kardashevskiy 2012-07-02 3:41 ` [Qemu-devel] " Alexey Kardashevskiy 2012-07-02 4:14 ` Alex Williamson 2012-07-02 4:14 ` [Qemu-devel] " Alex Williamson 2012-07-02 4:14 ` Alex Williamson 2012-06-28 6:44 ` Dan Carpenter [this message] 2012-06-28 6:44 ` [patch 1/3] vfio: signedness bug in vfio_config_do_rw() Dan Carpenter 2012-06-28 7:15 ` walter harms 2012-06-28 8:07 ` [patch 1/3 v2] " Dan Carpenter 2012-06-28 8:07 ` Dan Carpenter 2012-06-28 22:24 ` Alex Williamson 2012-06-28 22:24 ` Alex Williamson 2012-06-28 8:05 ` [patch 1/3] " Dan Carpenter 2012-06-28 6:44 ` [patch 2/3] vfio: make count unsigned to prevent integer underflow Dan Carpenter 2012-06-28 6:44 ` Dan Carpenter 2012-06-28 22:24 ` Alex Williamson 2012-06-28 22:24 ` Alex Williamson 2012-06-28 6:45 ` [patch 3/3] vfio: return -EFAULT on failure Dan Carpenter 2012-06-28 6:45 ` Dan Carpenter 2012-06-28 22:25 ` Alex Williamson 2012-06-28 22:25 ` Alex Williamson
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