Drivers: hv: vmbus: Fix virt_to_hvpfn() for X86_PAE

commit a9fc4340aee041dd186d1fb8f1b5d1e9caf28212 upstream.

In the case of X86_PAE, unsigned long is u32, but the physical address type
should be u64. Due to the bug here, the netvsc driver can not load
successfully, and sometimes the VM can panic due to memory corruption (the
hypervisor writes data to the wrong location).

Fixes: 6ba34171bcbd ("Drivers: hv: vmbus: Remove use of slow_virt_to_phys()")
Cc: stable@vger.kernel.org
Cc: Michael Kelley <mikelley@microsoft.com>
Reported-and-tested-by: Juliana Rodrigueiro <juliana.rodrigueiro@intra2net.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by:  Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 5f9505a087f61bbfd33172257a7d0bb6340140d9..23f358cb7f494c159e2ca9d74046b470b75673a1 100644 (file)
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -26,7 +26,7 @@
 
 static unsigned long virt_to_hvpfn(void *addr)
 {
-       unsigned long paddr;
+       phys_addr_t paddr;
 
        if (is_vmalloc_addr(addr))
                paddr = page_to_phys(vmalloc_to_page(addr)) +