3.6.11.9-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Jiang Liu <liuj97@xxxxxxxxx>
[ Upstream commit 6030ea9b35971a4200062f010341ab832e878ac9 ]
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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
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 6edefde..38a1b44 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -771,9 +771,11 @@ static void __exit zram_exit(void)
for (i = 0; i < num_devices; i++) {
zram = &zram_devices[i];
+ get_disk(zram->disk);
destroy_device(zram);
if (zram->init_done)
zram_reset_device(zram);
+ put_disk(zram->disk);
}
unregister_blkdev(zram_major, "zram");
--
1.7.10.4
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