linux-kernel - [PATCH] mm: fix uninitialized variables for find_vma

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Date:	Mon, 30 Jun 2008 19:54:42 +0300
From:	Benny Halevy <bhalevy@...asas.com>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, Benny Halevy <bhalevy@...asas.com>
Subject: [PATCH] mm: fix uninitialized variables for find_vma_prepare callers

gcc 4.3.0 correctly emits the following warnings.
When a vma covering addr is found, find_vma_prepare indeed returns without
setting pprev, rb_link, and rb_parent.

/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c: In function ‘insert_vm_struct’:
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2085: warning: ‘rb_parent’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2085: warning: ‘rb_link’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2084: warning: ‘prev’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c: In function ‘copy_vma’:
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2124: warning: ‘rb_parent’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2124: warning: ‘rb_link’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2123: warning: ‘prev’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c: In function ‘do_brk’:
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1951: warning: ‘rb_parent’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1951: warning: ‘rb_link’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1949: warning: ‘prev’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c: In function ‘mmap_region’:
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1092: warning: ‘rb_parent’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1092: warning: ‘rb_link’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1089: warning: ‘prev’ may be used uninitialized in this function

Signed-off-by: Benny Halevy <bhalevy@...asas.com>
---
 mm/mmap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 3354fdd..81b9873 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -366,7 +366,7 @@ find_vma_prepare(struct mm_struct *mm, unsigned long addr,
 		if (vma_tmp->vm_end > addr) {
 			vma = vma_tmp;
 			if (vma_tmp->vm_start <= addr)
-				return vma;
+				break;
 			__rb_link = &__rb_parent->rb_left;
 		} else {
 			rb_prev = __rb_parent;
-- 
1.5.6.GIT

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