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configfs fix for 5.12

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- fix a use-after-free in __configfs_open_file
    (Daiyue Zhang)
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Merge tag 'configfs-for-5.12' of git://git.infradead.org/users/hch/configfs

Pull configfs fix from Christoph Hellwig:

 - fix a use-after-free in __configfs_open_file (Daiyue Zhang)

* tag 'configfs-for-5.12' of git://git.infradead.org/users/hch/configfs:
  configfs: fix a use-after-free in __configfs_open_file
This commit is contained in:
Linus Torvalds 2021-03-12 11:48:14 -08:00
commit 8d9d53de51
1 changed files with 2 additions and 4 deletions
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6
fs/configfs/file.c
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@ -378,7 +378,7 @@ static int __configfs_open_file(struct inode *inode, struct file *file, int type
attr = to_attr(dentry);
if (!attr)
goto out_put_item;
goto out_free_buffer;
if (type & CONFIGFS_ITEM_BIN_ATTR) {
buffer->bin_attr = to_bin_attr(dentry);
@ -391,7 +391,7 @@ static int __configfs_open_file(struct inode *inode, struct file *file, int type
/* Grab the module reference for this attribute if we have one */
error = -ENODEV;
if (!try_module_get(buffer->owner))
goto out_put_item;
goto out_free_buffer;
error = -EACCES;
if (!buffer->item->ci_type)
@ -435,8 +435,6 @@ static int __configfs_open_file(struct inode *inode, struct file *file, int type
out_put_module:
module_put(buffer->owner);
out_put_item:
config_item_put(buffer->item);
out_free_buffer:
up_read(&frag->frag_sem);
kfree(buffer);