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authorJens Freimann <jfrei@linux.vnet.ibm.com>2015-03-16 14:17:13 +0300
committerChristian Borntraeger <borntraeger@de.ibm.com>2015-03-31 22:05:51 +0300
commit94aa033efcac47b09db22cb561e135baf37b7887 (patch)
tree2370d7dbd93fd307db16399de6229dbb0aa46d04 /Documentation/virtual/kvm
parenta3ed8dae6e3db479ca275883ba7fe994170b0ae6 (diff)
downloadlinux-94aa033efcac47b09db22cb561e135baf37b7887.tar.xz
KVM: s390: fix get_all_floating_irqs
This fixes a bug introduced with commit c05c4186bbe4 ("KVM: s390: add floating irq controller"). get_all_floating_irqs() does copy_to_user() while holding a spin lock. Let's fix this by filling a temporary buffer first and copy it to userspace after giving up the lock. Cc: <stable@vger.kernel.org> # 3.18+: 69a8d4562638 KVM: s390: no need to hold... Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'Documentation/virtual/kvm')
-rw-r--r--Documentation/virtual/kvm/devices/s390_flic.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt
index 4ceef53164b0..d1ad9d5cae46 100644
--- a/Documentation/virtual/kvm/devices/s390_flic.txt
+++ b/Documentation/virtual/kvm/devices/s390_flic.txt
@@ -27,6 +27,9 @@ Groups:
Copies all floating interrupts into a buffer provided by userspace.
When the buffer is too small it returns -ENOMEM, which is the indication
for userspace to try again with a bigger buffer.
+ -ENOBUFS is returned when the allocation of a kernelspace buffer has
+ failed.
+ -EFAULT is returned when copying data to userspace failed.
All interrupts remain pending, i.e. are not deleted from the list of
currently pending interrupts.
attr->addr contains the userspace address of the buffer into which all