ext4: use file_dentry()
EXT4 may be used as lower layer of overlayfs and accessing f_path.dentry can lead to a crash. Fix by replacing direct access of file->f_path.dentry with the file_dentry() accessor, which will always return a native object. Reported-by: Daniel Axtens <dja@axtens.net> Fixes:4bacc9c923
("overlayfs: Make f_path always point to the overlay and f_inode to the underlay") Fixes:ff978b09f9
("ext4 crypto: move context consistency check to ext4_file_open()") Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <stable@vger.kernel.org> # v4.5
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@ -374,7 +374,7 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
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return -ENOKEY;
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}
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dir = dget_parent(filp->f_path.dentry);
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dir = dget_parent(file_dentry(filp));
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if (ext4_encrypted_inode(d_inode(dir)) &&
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!ext4_is_child_context_consistent_with_parent(d_inode(dir), inode)) {
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ext4_warning(inode->i_sb,
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