4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Andreas Gruenbacher <[email protected]> commit 971df15bd54ad46e907046ff33750a137b2f0096 upstream. The standard return value for unsupported attribute names is -EOPNOTSUPP, as opposed to undefined but supported attributes (-ENODATA). Also, fail for attribute names like "system.sockprotonameXXX" and simplify the code a bit. Signed-off-by: Andreas Gruenbacher <[email protected]> Signed-off-by: Al Viro <[email protected]> [removes a build warning on 4.4.y - gregkh] Signed-off-by: Greg Kroah-Hartman <[email protected]> --- net/socket.c | 24 ++++++------------------ 1 file changed, 6 insertions(+), 18 deletions(-) --- a/net/socket.c +++ b/net/socket.c @@ -470,27 +470,15 @@ static struct socket *sockfd_lookup_ligh static ssize_t sockfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) { - const char *proto_name; - size_t proto_size; - int error; - - error = -ENODATA; - if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) { - proto_name = dentry->d_name.name; - proto_size = strlen(proto_name); - + if (!strcmp(name, XATTR_NAME_SOCKPROTONAME)) { if (value) { - error = -ERANGE; - if (proto_size + 1 > size) - goto out; - - strncpy(value, proto_name, proto_size + 1); + if (dentry->d_name.len + 1 > size) + return -ERANGE; + memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); } - error = proto_size + 1; + return dentry->d_name.len + 1; } - -out: - return error; + return -EOPNOTSUPP; } static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
