From: Bob Liu <lliubbo@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-mm@kvack.org, bhupesh.sharma@st.com,
laurent.pinchart@ideasonboard.com,
uclinux-dist-devel@blackfin.uclinux.org,
linux-media@vger.kernel.org, dhowells@redhat.com,
geert@linux-m68k.org, gerg@uclinux.org, stable@kernel.org,
gregkh@linuxfoundation.org, Bob Liu <lliubbo@gmail.com>
Subject: [PATCH] nommu: remap_pfn_range: fix addr parameter check
Date: Thu, 13 Sep 2012 10:40:57 +0800 [thread overview]
Message-ID: <1347504057-5612-1-git-send-email-lliubbo@gmail.com> (raw)
The addr parameter may not page aligned eg. when it's come from
vfb_mmap():vma->vm_start in video driver.
This patch fix the check in remap_pfn_range() else some driver like v4l2 will
fail in this function while calling mmap() on nommu arch like blackfin and st.
Reported-by: Bhupesh SHARMA <bhupesh.sharma@st.com>
Reported-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
---
mm/nommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/nommu.c b/mm/nommu.c
index d4b0c10..5d6068b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1819,7 +1819,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn, unsigned long size, pgprot_t prot)
{
- if (addr != (pfn << PAGE_SHIFT))
+ if ((addr & PAGE_MASK) != (pfn << PAGE_SHIFT))
return -EINVAL;
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
--
1.7.9.5
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next reply other threads:[~2012-09-13 2:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-13 2:40 Bob Liu [this message]
2012-09-13 19:27 ` [PATCH] nommu: remap_pfn_range: fix addr parameter check Andrew Morton
2012-09-14 9:23 ` Scott Jiang
2012-09-14 10:15 ` Bhupesh SHARMA
2012-09-14 10:39 ` Bhupesh SHARMA
2012-09-17 6:02 ` Scott Jiang
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