linux-kernel - [PATCH] Re: memory leak in reiserfs_fill

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Date:   Sat, 14 Dec 2019 15:12:57 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     syzbot <syzbot+1c6756baf4b16b94d2a6@...kaller.appspotmail.com>,
        deepa.kernel@...il.com, jack@...e.cz, jeffm@...e.com,
        jlayton@...nel.org, linux-kernel@...r.kernel.org,
        reiserfs-devel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: [PATCH] Re: memory leak in reiserfs_fill_super

From: Randy Dunlap <rdunlap@...radead.org>

fill_super() conditionally allocates a jdev string if "jdev=x"
is specified.  put_super() should free that memory.

Reported-by: syzbot+1c6756baf4b16b94d2a6@...kaller.appspotmail.com
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
---
 fs/reiserfs/super.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20191213.orig/fs/reiserfs/super.c
+++ linux-next-20191213/fs/reiserfs/super.c
@@ -629,6 +629,7 @@ static void reiserfs_put_super(struct su
 	reiserfs_write_unlock(s);
 	mutex_destroy(&REISERFS_SB(s)->lock);
 	destroy_workqueue(REISERFS_SB(s)->commit_wq);
+	kfree(REISERFS_SB(s)->s_jdev);
 	kfree(s->s_fs_info);
 	s->s_fs_info = NULL;
 }