Messages in this thread Patch in this message | | | Subject | [PATCH] Check for wraps in copy_page_range | From | Benjamin Herrenschmidt <> | Date | Thu, 17 Feb 2005 18:20:40 +1100 |
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Hi !
While browsing the 4 level page table changes (looking for a bug), I noticed that copy_page_range, unlike others, do not check for wraparound, which I suppose could be a problem with 4G/4G architectures or that sort of thing.
This patch fixes it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Index: linux-work/mm/memory.c =================================================================== --- linux-work.orig/mm/memory.c 2005-02-03 15:48:17.000000000 +1100 +++ linux-work/mm/memory.c 2005-02-16 14:51:37.000000000 +1100 @@ -358,7 +358,7 @@ for (; addr < end; addr = next, src_pmd++, dst_pmd++) { next = (addr + PMD_SIZE) & PMD_MASK; - if (next > end) + if (next > end || next <= addr) next = end; if (pmd_none(*src_pmd)) continue; @@ -390,7 +390,7 @@ for (; addr < end; addr = next, src_pud++, dst_pud++) { next = (addr + PUD_SIZE) & PUD_MASK; - if (next > end) + if (next > end || next <= addr) next = end; if (pud_none(*src_pud)) continue;
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