3.5.7.9 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Guo Chao <y...@linux.vnet.ibm.com>
commit b1a6650406875b9097a032eed89af50682fe1160 upstream.
When loopdev is built as module and we pass an invalid parameter,
loop_init() will return directly without deregister misc device, which
will cause an oops when insert loop module next time because we left some
garbage in the misc device list.
Test case:
sudo modprobe loop max_part=1024
(failed due to invalid parameter)
sudo modprobe loop
(oops)
Clean up nicely to avoid such oops.
Signed-off-by: Guo Chao <y...@linux.vnet.ibm.com>
Cc: Alexander Viro <v...@zeniv.linux.org.uk>
Cc: Guo Chao <y...@linux.vnet.ibm.com>
Cc: M. Hindess <hinde...@uk.ibm.com>
Cc: Nikanth Karthikesan <knika...@suse.de>
Cc: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Luis Henriques <luis.henriq...@canonical.com>
---
drivers/block/loop.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 11e702c..a77d9a5 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1833,11 +1833,15 @@ static int __init loop_init(void)
max_part = (1UL << part_shift) - 1;
}
- if ((1UL << part_shift) > DISK_MAX_PARTS)
- return -EINVAL;
+ if ((1UL << part_shift) > DISK_MAX_PARTS) {
+ err = -EINVAL;
+ goto misc_out;
+ }
- if (max_loop > 1UL << (MINORBITS - part_shift))
- return -EINVAL;
+ if (max_loop > 1UL << (MINORBITS - part_shift)) {
+ err = -EINVAL;
+ goto misc_out;
+ }
/*
* If max_loop is specified, create that many devices upfront.
@@ -1855,8 +1859,10 @@ static int __init loop_init(void)
range = 1UL << MINORBITS;
}
- if (register_blkdev(LOOP_MAJOR, "loop"))
- return -EIO;
+ if (register_blkdev(LOOP_MAJOR, "loop")) {
+ err = -EIO;
+ goto misc_out;
+ }
blk_register_region(MKDEV(LOOP_MAJOR, 0), range,
THIS_MODULE, loop_probe, NULL, NULL);
@@ -1869,6 +1875,10 @@ static int __init loop_init(void)
printk(KERN_INFO "loop: module loaded\n");
return 0;
+
+misc_out:
+ misc_deregister(&loop_misc);
+ return err;
}
static int loop_exit_cb(int id, void *ptr, void *data)
--
1.8.1.2
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