* [PATCH 7/8] mm/swap: check swapfile blocksize greater than PAGE_SIZE
@ 2014-01-27 10:03 Weijie Yang
0 siblings, 0 replies; only message in thread
From: Weijie Yang @ 2014-01-27 10:03 UTC (permalink / raw)
To: hughd
Cc: 'Andrew Morton', 'Minchan Kim',
shli, 'Bob Liu', weijie.yang.kh, 'Heesub Shin',
mquzik, 'Linux-MM', 'linux-kernel',
stable
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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2014-01-27 10:03 [PATCH 7/8] mm/swap: check swapfile blocksize greater than PAGE_SIZE Weijie Yang
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