linux-kernel - [PATCH 3.12 27/33] bio: fix argument of __bio_add_page() for max

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Date:	Tue, 15 Sep 2015 16:22:22 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Akinobu Mita <akinobu.mita@...il.com>,
	Jens Axboe <axboe@...nel.dk>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 27/33] bio: fix argument of __bio_add_page() for max_sectors > 0xffff

From: Akinobu Mita <akinobu.mita@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 34f2fd8dfe6185b0eaaf7d661281713a6170b077 upstream.

The data type of max_sectors and max_hw_sectors in queue settings are
unsigned int.  But these values are passed to __bio_add_page() as an
argument whose data type is unsigned short.  In the worst case such as
max_sectors is 0x10000, bio_add_page() can't add a page and IOs can't
proceed.

Cc: Jens Axboe <axboe@...nel.dk>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/bio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/bio.c b/fs/bio.c
index ea5035da4d9a..e7fb3f82f5f5 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -601,7 +601,7 @@ EXPORT_SYMBOL(bio_get_nr_vecs);
 
 static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
 			  *page, unsigned int len, unsigned int offset,
-			  unsigned short max_sectors)
+			  unsigned int max_sectors)
 {
 	int retried_segments = 0;
 	struct bio_vec *bvec;
-- 
2.5.2

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