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ubifs: xattr: Fix some potential memory leaks while iterating entries 

Fix some potential memory leaks in error handling branches while
iterating xattr entries. For example, function ubifs_tnc_remove_ino()
forgets to free pxent if it exists. Similar problems also exist in
ubifs_purge_xattrs(), ubifs_add_orphan() and ubifs_jnl_write_inode().

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Cc: <stable@vger.kernel.org>
Fixes: 1e51764a3c ("UBIFS: add new flash file system")
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Zhihao Cheng 2020-06-01 17:10:36 +08:00 committed by Richard Weinberger
parent e4c26faa42
commit f2aae745b8
4 changed files with 9 additions and 0 deletions
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2
fs/ubifs/journal.c
View File

@ -894,6 +894,7 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)
if (err == -ENOENT)
break;
kfree(pxent);
goto out_release;
}
@ -906,6 +907,7 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)
ubifs_err(c, "dead directory entry '%s', error %d",
xent->name, err);
ubifs_ro_mode(c, err);
kfree(pxent);
kfree(xent);
goto out_release;
}

2
fs/ubifs/orphan.c
View File

@ -173,6 +173,7 @@ int ubifs_add_orphan(struct ubifs_info *c, ino_t inum)
err = PTR_ERR(xent);
if (err == -ENOENT)
break;
kfree(pxent);
return err;
}
@ -182,6 +183,7 @@ int ubifs_add_orphan(struct ubifs_info *c, ino_t inum)
xattr_orphan = orphan_add(c, xattr_inum, orphan);
if (IS_ERR(xattr_orphan)) {
kfree(pxent);
kfree(xent);
return PTR_ERR(xattr_orphan);
}

3
fs/ubifs/tnc.c
View File

@ -2885,6 +2885,7 @@ int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum)
err = PTR_ERR(xent);
if (err == -ENOENT)
break;
kfree(pxent);
return err;
}
@ -2898,6 +2899,7 @@ int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum)
fname_len(&nm) = le16_to_cpu(xent->nlen);
err = ubifs_tnc_remove_nm(c, &key1, &nm);
if (err) {
kfree(pxent);
kfree(xent);
return err;
}
@ -2906,6 +2908,7 @@ int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum)
highest_ino_key(c, &key2, xattr_inum);
err = ubifs_tnc_remove_range(c, &key1, &key2);
if (err) {
kfree(pxent);
kfree(xent);
return err;
}

2
fs/ubifs/xattr.c
View File

@ -522,6 +522,7 @@ int ubifs_purge_xattrs(struct inode *host)
xent->name, err);
ubifs_ro_mode(c, err);
kfree(pxent);
kfree(xent);
return err;
}
@ -531,6 +532,7 @@ int ubifs_purge_xattrs(struct inode *host)
err = remove_xattr(c, host, xino, &nm);
if (err) {
kfree(pxent);
kfree(xent);
iput(xino);
ubifs_err(c, "cannot remove xattr, error %d", err);
return err;