[PATCH 2/2] DSPBRIDGE: introduce VMA checking for cache operation

[Hiroshi DOYU]

Check if the given area blongs to process virtul memory address space.

Signed-off-by: Hiroshi DOYU <hiroshi.d...@nokia.com>
---
 drivers/dsp/bridge/rmgr/proc.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/drivers/dsp/bridge/rmgr/proc.c b/drivers/dsp/bridge/rmgr/proc.c
index 3a2879f..fe9dabf 100644
--- a/drivers/dsp/bridge/rmgr/proc.c
+++ b/drivers/dsp/bridge/rmgr/proc.c
@@ -735,6 +735,30 @@ DSP_STATUS PROC_EnumNodes(DSP_HPROCESSOR hProcessor, OUT 
DSP_HNODE *aNodeTab,
        return status;
 }
 
+/* Check if the given area blongs to process virtul memory address space */
+static int memory_check_vma(unsigned long start, u32 len)
+{
+       int err = 0;
+       unsigned long end;
+       struct vm_area_struct *vma;
+
+       len = PAGE_ALIGN(len);
+       end = start + len;
+       if (end <= start)
+               return -EINVAL;
+
+       down_read(&current->mm->mmap_sem);
+
+       vma = find_vma(current->mm, start);
+       if (!vma || start < vma->vm_start) {
+               pr_err("%s: no vma for %08lx %08lx\n", __func__, start, end);
+               err = -EINVAL;
+       }
+
+       up_read(&current->mm->mmap_sem);
+
+       return err;
+}
 
 static DSP_STATUS proc_memory_sync(DSP_HPROCESSOR hProcessor, void *pMpuAddr,
                                   u32 ulSize, u32 ulFlags,
@@ -757,6 +781,14 @@ static DSP_STATUS proc_memory_sync(DSP_HPROCESSOR 
hProcessor, void *pMpuAddr,
                goto err_out;
        }
 
+       if (memory_check_vma((u32)pMpuAddr, ulSize)) {
+               GT_3trace(PROC_DebugMask, GT_7CLASS,
+                         "%s: InValid address parameters\n",
+                         __func__, pMpuAddr, ulSize);
+               status = DSP_EHANDLE;
+               goto err_out;
+       }
+
        (void)SYNC_EnterCS(hProcLock);
        MEM_FlushCache(pMpuAddr, ulSize, FlushMemType);
        (void)SYNC_LeaveCS(hProcLock);
-- 
1.6.0.4

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