Messages in this thread Patch in this message | | | From | Jiang Liu <> | Subject | [RFC PATCH v1 6/8] zram: avoid access beyond the zram device | Date | Mon, 3 Jun 2013 23:42:18 +0800 |
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Function valid_io_request() should verify the entire request doesn't exceed the zram device, otherwise it will cause invalid memory access.
Signed-off-by: Jiang Liu <jiang.liu@huawei.com> --- drivers/staging/zram/zram_drv.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 66cf28a..64b51b9 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -428,6 +428,10 @@ static inline int valid_io_request(struct zram *zram, struct bio *bio) return 0; } + if (unlikely((bio->bi_sector << SECTOR_SHIFT) + bio->bi_size >= + zram->disksize)) + return 0; + /* I/O request is valid */ return 1; } -- 1.8.1.2
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