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authorSebastian Ott <sebott@linux.vnet.ibm.com>2015-02-25 13:17:48 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-02-26 09:24:48 +0100
commitf0483044c1c96089256cda4cf182eea1ead77fe4 (patch)
tree796dbcd919384e53c5bab81ccd14e6aed6b4a663 /arch/s390/pci
parent3a9f9183bdd341a25c7805d96bbd78a31d559381 (diff)
downloadop-kernel-dev-f0483044c1c96089256cda4cf182eea1ead77fe4.zip
op-kernel-dev-f0483044c1c96089256cda4cf182eea1ead77fe4.tar.gz
s390/pci: fix possible information leak in mmio syscall
Make sure that even in error situations we do not use copy_to_user on uninitialized kernel memory. Cc: stable@vger.kernel.org # 3.19+ Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/pci')
-rw-r--r--arch/s390/pci/pci_mmio.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/arch/s390/pci/pci_mmio.c b/arch/s390/pci/pci_mmio.c
index 8aa271b..b1bb2b7 100644
--- a/arch/s390/pci/pci_mmio.c
+++ b/arch/s390/pci/pci_mmio.c
@@ -64,8 +64,7 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr,
if (copy_from_user(buf, user_buffer, length))
goto out;
- memcpy_toio(io_addr, buf, length);
- ret = 0;
+ ret = zpci_memcpy_toio(io_addr, buf, length);
out:
if (buf != local_buf)
kfree(buf);
@@ -98,16 +97,16 @@ SYSCALL_DEFINE3(s390_pci_mmio_read, unsigned long, mmio_addr,
goto out;
io_addr = (void __iomem *)((pfn << PAGE_SHIFT) | (mmio_addr & ~PAGE_MASK));
- ret = -EFAULT;
- if ((unsigned long) io_addr < ZPCI_IOMAP_ADDR_BASE)
+ if ((unsigned long) io_addr < ZPCI_IOMAP_ADDR_BASE) {
+ ret = -EFAULT;
goto out;
-
- memcpy_fromio(buf, io_addr, length);
-
- if (copy_to_user(user_buffer, buf, length))
+ }
+ ret = zpci_memcpy_fromio(buf, io_addr, length);
+ if (ret)
goto out;
+ if (copy_to_user(user_buffer, buf, length))
+ ret = -EFAULT;
- ret = 0;
out:
if (buf != local_buf)
kfree(buf);
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