The patch titled
mm/nommu.c: fix remap_pfn_range()
has been added to the -mm tree. Its filename is
mm-nommuc-fix-remap_pfn_range.patch
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------------------------------------------------------
Subject: mm/nommu.c: fix remap_pfn_range()
From: Bob Liu <lliubbo@xxxxxxxxx>
remap_pfn_range() does not update vma->end on no mmu arch which will cause
munmap() fail because it can't match the vma.
eg. fb_mmap() in fbmem.c will call io_remap_pfn_range() which is
remap_pfn_range() on nommu arch, if an address is not page aligned
vma->start will be changed in remap_pfn_range(), but neither size nor
vma->end will be updated. Then munmap(start, len) can't find the vma to
free, because it need to compare (start + len) with vma->end.
Signed-off-by: Bob Liu <lliubbo@xxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Greg Ungerer <gerg@xxxxxxxxxxx>
Cc: Mike Frysinger <vapier@xxxxxxxxxx>
Cc: Bob Liu <lliubbo@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/nommu.c | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/nommu.c~mm-nommuc-fix-remap_pfn_range mm/nommu.c
--- a/mm/nommu.c~mm-nommuc-fix-remap_pfn_range
+++ a/mm/nommu.c
@@ -1817,6 +1817,7 @@ int remap_pfn_range(struct vm_area_struc
unsigned long to, unsigned long size, pgprot_t prot)
{
vma->vm_start = vma->vm_pgoff << PAGE_SHIFT;
+ vma->vm_end = vma->vm_start + size;
return 0;
}
EXPORT_SYMBOL(remap_pfn_range);
_
Patches currently in -mm which might be from lliubbo@xxxxxxxxx are
origin.patch
mm-nommuc-fix-remap_pfn_range.patch
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