This is a note to let you know that I've just added the patch titled
Staging: zram: Fix memory leak by refcount mismatch
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-zram-fix-memory-leak-by-refcount-mismatch.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1b672224d128ec2570eb37572ff803cfe452b4f7 Mon Sep 17 00:00:00 2001
From: Rashika Kheria <rashika.kheria@xxxxxxxxx>
Date: Sun, 10 Nov 2013 22:13:53 +0530
Subject: Staging: zram: Fix memory leak by refcount mismatch
From: Rashika Kheria <rashika.kheria@xxxxxxxxx>
commit 1b672224d128ec2570eb37572ff803cfe452b4f7 upstream.
As suggested by Minchan Kim and Jerome Marchand "The code in reset_store
get the block device (bdget_disk()) but it does not put it (bdput()) when
it's done using it. The usage count is therefore incremented but never
decremented."
This patch also puts bdput() for all error cases.
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Acked-by: Jerome Marchand <jmarchan@xxxxxxxxxx>
Signed-off-by: Rashika Kheria <rashika.kheria@xxxxxxxxx>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
[wyj: Backported to 3.4: adjust context]
Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/zram/zram_sysfs.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
--- a/drivers/staging/zram/zram_sysfs.c
+++ b/drivers/staging/zram/zram_sysfs.c
@@ -99,18 +99,23 @@ static ssize_t reset_store(struct device
return -ENOMEM;
/* Do not reset an active device! */
- if (bdev->bd_holders)
- return -EBUSY;
+ if (bdev->bd_holders) {
+ ret = -EBUSY;
+ goto out;
+ }
ret = kstrtou16(buf, 10, &do_reset);
if (ret)
- return ret;
+ goto out;
- if (!do_reset)
- return -EINVAL;
+ if (!do_reset) {
+ ret = -EINVAL;
+ goto out;
+ }
/* Make sure all pending I/O is finished */
fsync_bdev(bdev);
+ bdput(bdev);
down_write(&zram->init_lock);
if (zram->init_done)
@@ -118,6 +123,10 @@ static ssize_t reset_store(struct device
up_write(&zram->init_lock);
return len;
+
+out:
+ bdput(bdev);
+ return ret;
}
static ssize_t num_reads_show(struct device *dev,
Patches currently in stable-queue which might be from rashika.kheria@xxxxxxxxx are
queue-3.4/staging-zram-fix-memory-leak-by-refcount-mismatch.patch
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