[PATCH v3 01/10] zram: avoid invalid memory access in zram_exit()
Jiang Liu
liuj97 at gmail.com
Thu Jun 6 16:07:22 UTC 2013
Memory for zram->disk object may have already been freed after returning
from destroy_device(zram), then it's unsafe for zram_reset_device(zram)
to access zram->disk again.
We can't solve this bug by flipping the order of destroy_device(zram)
and zram_reset_device(zram), that will cause deadlock issues to the
zram sysfs handler.
So fix it by holding an extra reference to zram->disk before calling
destroy_device(zram).
Signed-off-by: Jiang Liu <jiang.liu at huawei.com>
Cc: stable at vger.kernel.org
---
drivers/staging/zram/zram_drv.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index e34e3fe..ee6b67d 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -727,8 +727,10 @@ static void __exit zram_exit(void)
for (i = 0; i < num_devices; i++) {
zram = &zram_devices[i];
+ get_disk(zram->disk);
destroy_device(zram);
zram_reset_device(zram);
+ put_disk(zram->disk);
}
unregister_blkdev(zram_major, "zram");
--
1.8.1.2
More information about the devel
mailing list