This is a note to let you know that I've just added the patch titled
ubifs: Fix memory leak in do_rename
to the 6.3-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:
ubifs-fix-memory-leak-in-do_rename.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3a36d20e012903f45714df2731261fdefac900cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A5rten=20Lindahl?= <marten.lindahl@xxxxxxxx>
Date: Thu, 30 Mar 2023 16:40:59 +0200
Subject: ubifs: Fix memory leak in do_rename
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From: Mårten Lindahl <marten.lindahl@xxxxxxxx>
commit 3a36d20e012903f45714df2731261fdefac900cb upstream.
If renaming a file in an encrypted directory, function
fscrypt_setup_filename allocates memory for a file name. This name is
never used, and before returning to the caller the memory for it is not
freed.
When running kmemleak on it we see that it is registered as a leak. The
report below is triggered by a simple program 'rename' that renames a
file in an encrypted directory:
unreferenced object 0xffff888101502840 (size 32):
comm "rename", pid 9404, jiffies 4302582475 (age 435.735s)
backtrace:
__kmem_cache_alloc_node
__kmalloc
fscrypt_setup_filename
do_rename
ubifs_rename
vfs_rename
do_renameat2
To fix this we can remove the call to fscrypt_setup_filename as it's not
needed.
Fixes: 278d9a243635f26 ("ubifs: Rename whiteout atomically")
Reported-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Signed-off-by: Mårten Lindahl <marten.lindahl@xxxxxxxx>
Reviewed-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ubifs/dir.c | 6 ------
1 file changed, 6 deletions(-)
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -358,7 +358,6 @@ static struct inode *create_whiteout(str
umode_t mode = S_IFCHR | WHITEOUT_MODE;
struct inode *inode;
struct ubifs_info *c = dir->i_sb->s_fs_info;
- struct fscrypt_name nm;
/*
* Create an inode('nlink = 1') for whiteout without updating journal,
@@ -369,10 +368,6 @@ static struct inode *create_whiteout(str
dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
dentry, mode, dir->i_ino);
- err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
- if (err)
- return ERR_PTR(err);
-
inode = ubifs_new_inode(c, dir, mode, false);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
@@ -395,7 +390,6 @@ out_inode:
make_bad_inode(inode);
iput(inode);
out_free:
- fscrypt_free_filename(&nm);
ubifs_err(c, "cannot create whiteout file, error %d", err);
return ERR_PTR(err);
}
Patches currently in stable-queue which might be from marten.lindahl@xxxxxxxx are
queue-6.3/ubifs-fix-memory-leak-in-do_rename.patch
queue-6.3/ubifs-free-memory-for-tmpfile-name.patch
