[PATCH] mm: Check we have the right vma in access_process_vm()

Michael Ellerman michael at ellerman.id.au
Tue Apr 5 16:24:31 EST 2011

In access_process_vm() we need to check that we have found the right
vma, not the following vma, before we try to access it. Otherwise
we might call the vma's access routine with an address which does
not fall inside the vma.

Signed-off-by: Michael Ellerman <michael at ellerman.id.au>
 mm/memory.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 5823698..7e6f17b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3619,7 +3619,7 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
 			vma = find_vma(mm, addr);
-			if (!vma)
+			if (!vma || vma->vm_start > addr)
 			if (vma->vm_ops && vma->vm_ops->access)
 				ret = vma->vm_ops->access(vma, addr, buf,

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