Re: [PATCH] fix an endianness bug in ext4_encrypted_follow_link()

[Joe Perches <joe@perches.com>]

(cc'ing Julia Lawall)

On Thu, 2015-11-26 at 15:27 +0000, Al Viro wrote:
> applying le32_to_cpu() to 16bit value is a bad idea...

Julia, perhaps you or your crew could produce a coccinelle test
for this class of error?

> diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
> index abe2401..e8e7af6 100644
> --- a/fs/ext4/symlink.c
> +++ b/fs/ext4/symlink.c
> @@ -52,7 +52,7 @@ static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cook
>  	/* Symlink is encrypted */
>  	sd = (struct ext4_encrypted_symlink_data *)caddr;
>  	cstr.name = sd->encrypted_path;
> -	cstr.len  = le32_to_cpu(sd->len);
> +	cstr.len  = le16_to_cpu(sd->len);
>  	if ((cstr.len +
>  	     sizeof(struct ext4_encrypted_symlink_data) - 1) >
>  	    max_size) {