Description: cifs: fix underflow in parse_server_interfaces()
References:
Notes:
 carnil> Introduced in fe856be475f7 ("CIFS: parse and store info on iface queries").
 carnil> Vulnerable versions: 4.18-rc2.
Bugs:
upstream: released (6.8-rc5) [cffe487026be13eaf37ea28b783d9638ab147204]
6.8-upstream-stable: N/A "Fixed before branching point"
6.7-upstream-stable: released (6.7.6) [df2af9fdbc4ddde18a3371c4ca1a86596e8be301]
6.6-upstream-stable: released (6.6.18) [f7ff1c89fb6e9610d2b01c1821727729e6609308]
6.1-upstream-stable: released (6.1.79) [7190353835b4a219abb70f90b06cdcae97f11512]
5.10-upstream-stable: needed
4.19-upstream-stable: needed
sid: released (6.7.7-1)
6.1-bookworm-security: released (6.1.82-1)
5.10-bullseye-security: needed
4.19-buster-security: needed