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Date: Mon, 1 Dec 2014 23:04:08 -0500 From: Sasha Levin <sasha.levin@...cle.com> To: linux-kernel@...r.kernel.org Cc: Sasha Levin <sasha.levin@...cle.com>, linux-mm@...ck.org (open list:MEMORY MANAGEMENT) Subject: [PATCH] mm: fadvise: avoid signed integer overflow calculating offset Both offset and len are signed integers who's overflow isn't defined. Use unsigned addition to avoid the issue. Signed-off-by: Sasha Levin <sasha.levin@...cle.com> --- mm/fadvise.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/fadvise.c b/mm/fadvise.c index 3bcfd81d..762cb63 100644 --- a/mm/fadvise.c +++ b/mm/fadvise.c @@ -67,7 +67,7 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice) } /* Careful about overflows. Len == 0 means "as much as possible" */ - endbyte = offset + len; + endbyte = offset + (u64)len; if (!len || endbyte < len) endbyte = -1; else -- 1.7.10.4 -- 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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