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....@huawei.com>
Cc: sta...@vger.kernel.org
---
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 6a54bb9..1c3974f 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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