Commit 29bb3158 authored Apr 27, 2017 by Daniel N Pettersson Committed by Steve French May 02, 2017

cifs: fix IPv6 link local, with scope id, address parsing



When the IP address is gotten from the UNC, use only the address part
of the UNC. Else all after the percent sign in an IPv6 link local
address is interpreted as a scope id. This includes the slash and
share name. A scope id is expected to be an integer and any trailing
characters makes the conversion to integer fail.
Example of mount command that fails:
mount -i -t cifs //fe80::6a05:caff:fe3e:8ffc%2/test /mnt/t -o sec=none

Signed-off-by: Daniel N Pettersson <danielnp@axis.com>
Signed-off-by: Steve French <smfrench@gmail.com>

parent 564277ec

fs/cifs/connect.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -1945,9 +1945,14 @@ cifs_parse_mount_options(const char mountdata, const char devname,
		}

		if (!got_ip) {
		int len;
		const char *slash;

		/* No ip= option specified? Try to get it from UNC */
		if (!cifs_convert_address(dstaddr, &vol->UNC[2],
		strlen(&vol->UNC[2]))) {
		/* Use the address part of the UNC. */
		slash = strchr(&vol->UNC[2], '\\');
		len = slash - &vol->UNC[2];
		if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
		pr_err("Unable to determine destination address.\n");
		goto cifs_parse_mount_err;
		}