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debugfs: fix debugfs_rename parameter checking

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debugfs_rename() needs to check that the dentries passed into it really
are valid, as sometimes they are not (i.e. if the return value of
another debugfs call is passed into this one.)  So fix this up by
properly checking if the two parent directories are errors (they are
allowed to be NULL), and if the dentry to rename is not NULL or an
error.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2019-01-23 11:27:02 +01:00
parent 3a34c98632
commit d88c93f090
1 changed files with 7 additions and 0 deletions
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7
fs/debugfs/inode.c
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@ -787,6 +787,13 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
struct dentry *dentry = NULL, *trap;
struct name_snapshot old_name;
if (IS_ERR(old_dir))
return old_dir;
if (IS_ERR(new_dir))
return new_dir;
if (IS_ERR_OR_NULL(old_dentry))
return old_dentry;
trap = lock_rename(new_dir, old_dir);
/* Source or destination directories don't exist? */
if (d_really_is_negative(old_dir) || d_really_is_negative(new_dir))