From: Mårten Lindahl marten.lindahl@axis.com
mainline inclusion from mainline-v6.4-rc1 commit 3a36d20e012903f45714df2731261fdefac900cb category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7JO0G CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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@huawei.com Signed-off-by: Mårten Lindahl marten.lindahl@axis.com Reviewed-by: Zhihao Cheng chengzhihao1@huawei.com Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger richard@nod.at Signed-off-by: ZhaoLong Wang wangzhaolong1@huawei.com --- fs/ubifs/dir.c | 6 ------ 1 file changed, 6 deletions(-)
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 4f75c802a02b..33f2da805c97 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -357,7 +357,6 @@ static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry) 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, @@ -368,10 +367,6 @@ static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry) 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); @@ -394,7 +389,6 @@ static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry) 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); }