From: Weijie Yang <weijie.yang@samsung.com>
To: hughd@google.com
Cc: 'Andrew Morton' <akpm@linux-foundation.org>,
'Minchan Kim' <minchan@kernel.org>,
shli@kernel.org, 'Bob Liu' <bob.liu@oracle.com>,
weijie.yang.kh@gmail.com, 'Heesub Shin' <heesub.shin@samsung.com>,
mquzik@redhat.com, 'Linux-MM' <linux-mm@kvack.org>,
'linux-kernel' <linux-kernel@vger.kernel.org>,
stable@vger.kernel.org
Subject: [PATCH 7/8] mm/swap: check swapfile blocksize greater than PAGE_SIZE
Date: Mon, 27 Jan 2014 18:03:04 +0800 [thread overview]
Message-ID: <000801cf1b47$3fcab170$bf601450$%yang@samsung.com> (raw)
If S_ISREG swapfile's blocksize > PAGE_SIZE, it is not suitable to be
a swapfile, because swap slot is fixed to PAGE_SIZE.
This patch check this situation and return -EINVAL if it happens.
Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
---
mm/page_io.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/page_io.c b/mm/page_io.c
index 7247be6..3d9bd12 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -150,6 +150,8 @@ int generic_swapfile_activate(struct swap_info_struct *sis,
int ret;
blkbits = inode->i_blkbits;
+ if(blkbits > PAGE_SHIFT)
+ return -EINVAL;
blocks_per_page = PAGE_SIZE >> blkbits;
/*
--
1.7.10.4
--
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reply other threads:[~2014-01-27 10:11 UTC|newest]
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