This is a note to let you know that I've just added the patch titled ext4: use file_dentry() to the 4.5-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ext4-use-file_dentry.patch and it can be found in the queue-4.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From c0a37d48788475d0a2cf4fbfaa28559a9de612fc Mon Sep 17 00:00:00 2001 From: Miklos Szeredi <mszeredi@xxxxxxxxxx> Date: Sat, 26 Mar 2016 16:14:42 -0400 Subject: ext4: use file_dentry() From: Miklos Szeredi <mszeredi@xxxxxxxxxx> commit c0a37d48788475d0a2cf4fbfaa28559a9de612fc upstream. 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@xxxxxxxxxx> Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay") Fixes: ff978b09f973 ("ext4 crypto: move context consistency check to ext4_file_open()") Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx> Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Cc: David Howells <dhowells@xxxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/ext4/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -380,7 +380,7 @@ static int ext4_file_open(struct inode * return -ENOKEY; } - dir = dget_parent(filp->f_path.dentry); + dir = dget_parent(file_dentry(filp)); if (ext4_encrypted_inode(d_inode(dir)) && !ext4_is_child_context_consistent_with_parent(d_inode(dir), inode)) { ext4_warning(inode->i_sb, Patches currently in stable-queue which might be from mszeredi@xxxxxxxxxx are queue-4.5/ext4-use-dget_parent-in-ext4_file_open.patch queue-4.5/ext4-use-file_dentry.patch queue-4.5/nfs-use-file_dentry.patch queue-4.5/fs-add-file_dentry.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html