linux-kernel - [PATCH] FRV: Fix error handling in is_user_addr

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Date:	Fri, 21 Nov 2008 16:07:44 +0000
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH] FRV: Fix error handling in is_user_addr_valid()

Fix error handling in is_user_addr_valid() in NOMMU mode to check whether
find_vma() actually worked or not.  This checks whether ptrace() is allowed to
access an address.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 arch/frv/kernel/ptrace.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


diff --git a/arch/frv/kernel/ptrace.c b/arch/frv/kernel/ptrace.c
index e9af8de..5e7d401 100644
--- a/arch/frv/kernel/ptrace.c
+++ b/arch/frv/kernel/ptrace.c
@@ -83,7 +83,7 @@ static inline int is_user_addr_valid(struct task_struct *child,
 	struct vm_area_struct *vma;
 
 	vma = find_vma(child->mm, start);
-	if (start >= vma->vm_start && start + len <= vma->vm_end)
+	if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
 		return 0;
 
 	return -EIO;

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