diff options
| author |   Minchan Kim <minchan@kernel.org> | 2017-04-13 14:56:35 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-04-13 18:24:21 -0700 |
| commit | 4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5 (patch) | |
| tree | d1bdc863cfecc1caa2153006fdcc71f1f3637171 /drivers | |
| parent | hugetlbfs: fix offset overflow in hugetlbfs mmap (diff) | |
| download | linux-dev-4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5.tar.xz linux-dev-4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5.zip | |
zram: fix operator precedence to get offset
In zram_rw_page, the logic to get offset is wrong by operator precedence
(i.e., "<<" is higher than "&"). With wrong offset, zram can corrupt
the user's data. This patch fixes it.
Fixes: 8c7f01025 ("zram: implement rw_page operation of zram")
Link: http://lkml.kernel.org/r/1492042622-12074-1-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index dceb5edd1e54..03a7408e090d 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -928,7 +928,7 @@ static int zram_rw_page(struct block_device *bdev, sector_t sector, } index = sector >> SECTORS_PER_PAGE_SHIFT; - offset = sector & (SECTORS_PER_PAGE - 1) << SECTOR_SHIFT; + offset = (sector & (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT; bv.bv_page = page; bv.bv_len = PAGE_SIZE; |