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Message-Id: <c4f5166f98cb703742191eb74f583bb8011f9cdf.1301984663.git.michael@ellerman.id.au> Date: Tue, 5 Apr 2011 16:24:31 +1000 (EST) From: Michael Ellerman <michael@...erman.id.au> To: <linux-kernel@...r.kernel.org> Cc: <linux-mm@...ck.org>, <hughd@...gle.com>, <walken@...gle.com>, <aarcange@...hat.com>, <riel@...hat.com>, Andrew Morton <akpm@...l.org>, <linuxppc-dev@...abs.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org> Subject: [PATCH] mm: Check we have the right vma in access_process_vm() 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@...erman.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 */ #ifdef CONFIG_HAVE_IOREMAP_PROT vma = find_vma(mm, addr); - if (!vma) + if (!vma || vma->vm_start > addr) break; if (vma->vm_ops && vma->vm_ops->access) ret = vma->vm_ops->access(vma, addr, buf, -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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