linux-kernel - [PATCH, v2] Fix potentially derefencing uninitialized 'r'.

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Date:	Tue, 21 Feb 2012 17:58:23 +0900
From:	Geunsik Lim <geunsik.lim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: [PATCH, v2] Fix potentially derefencing uninitialized 'r'.

From: Geunsik Lim <geunsik.lim@...sung.com>

v2: reorganize the code with better way to avoid compilation warning
via the comment of Andrew Morton.

v1: struct memblock_region 'r' will not be initialized potentially
because of while() condition in __next_mem_pfn_range()function.
Solve the compilation warning related problem by initializing
r data structure.

Signed-off-by: Geunsik Lim <geunsik.lim@...sung.com>
---
 mm/memblock.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 77b5f22..b8c40c5 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -673,14 +673,18 @@ void __init_memblock __next_mem_pfn_range(int *idx, int nid,
 	struct memblock_type *type = &memblock.memory;
 	struct memblock_region *r;
 
-	while (++*idx < type->cnt) {
+	do {
 		r = &type->regions[*idx];
 
+	   if (++*idx < type->cnt) {
 		if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
 			continue;
 		if (nid == MAX_NUMNODES || nid == r->nid)
 			break;
-	}
+	   } else
+		break;
+	} while (1);
+
 	if (*idx >= type->cnt) {
 		*idx = -1;
 		return;
-- 
1.7.8.1

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