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Message-ID: <20081121160744.17135.78532.stgit@warthog.procyon.org.uk>
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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