linux-kernel - [PATCH] bitmap: fix address_space conversion on __bitmap

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Date:	Fri, 13 Aug 2010 23:55:34 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] bitmap: fix address_space conversion on __bitmap_parse

buf can be a user-space pointer in case of is_user, 3rd arg, is 1.
But casting to ubuf lacks required address_space notations. Add it.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 lib/bitmap.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/bitmap.c b/lib/bitmap.c
index ffb78c9..42205d8 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -422,7 +422,7 @@ int __bitmap_parse(const char *buf, unsigned int buflen,
 {
 	int c, old_c, totaldigits, ndigits, nchunks, nbits;
 	u32 chunk;
-	const char __user *ubuf = buf;
+	const char __user *ubuf = (const char __user __force *) buf;
 
 	bitmap_zero(maskp, nmaskbits);
 
@@ -507,7 +507,8 @@ int bitmap_parse_user(const char __user *ubuf,
 {
 	if (!access_ok(VERIFY_READ, ubuf, ulen))
 		return -EFAULT;
-	return __bitmap_parse((const char *)ubuf, ulen, 1, maskp, nmaskbits);
+	return __bitmap_parse((const char __force *)ubuf, ulen, 1,
+			      maskp, nmaskbits);
 }
 EXPORT_SYMBOL(bitmap_parse_user);
 
-- 
1.7.0.4

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