linux-kernel - [PATCH] kernel: avoid overflow in cmp

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Message-id: <3E2D3190-D01C-4BCE-8E6F-B2BB9BC29984@me.com>
Date:	Wed, 14 Jan 2015 13:31:18 -0700
From:	Louis Langholtz <lou_langholtz@...com>
To:	linux-kernel@...r.kernel.org, yinghai@...nel.org,
	hpa@...ux.intel.com
Cc:	torvalds@...ux-foundation.org
Subject: [PATCH] kernel: avoid overflow in cmp_range

Avoid overflow possibility.

Signed-off-by: Louis Langholtz <lou_langholtz@...com>
---
diff --git a/kernel/range.c b/kernel/range.c
index 322ea8e..06d9ee7 100644
--- a/kernel/range.c
+++ b/kernel/range.c
@@ -113,12 +113,16 @@ static int cmp_range(const void *x1, const void *x2)
{
      const struct range *r1 = x1;
      const struct range *r2 = x2;
-       s64 start1, start2;
+       u64 start1, start2;

      start1 = r1->start;
      start2 = r2->start;

-       return start1 - start2;
+       if (start1 < start2)
+               return -1;
+       if (start1 > start2)
+               return 1;
+       return 0;
}

int clean_sort_range(struct range *range, int az)
--
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