Linux kernel bug fix: net: check extack._msg before print
Subsystem: networking (net/core/dev.c)
Bug type: crash, severity: high
Files changed: net/core/dev.c
Introduced by Stephen Hemminger on 2018-07-29 12:57:26 -0700; fixed by Li RongQing on 2018-08-05 17:24:45 -0700 (lifetime: 7 days)