From: Nathan Lynch In sched_exec, schedstat_inc will dereference a null pointer if no domain is found with the SD_BALANCE_EXEC flag set. This was exposed during testing of the previous patches where cpus are temporarily attached to a dummy domain without SD_BALANCE_EXEC set. Signed-off-by: Nathan Lynch Signed-off-by: Andrew Morton --- 25-akpm/kernel/sched.c | 2 +- 1 files changed, 1 insertion(+), 1 deletion(-) diff -puN kernel/sched.c~fix-schedstats-null-deref-in-sched_exec kernel/sched.c --- 25/kernel/sched.c~fix-schedstats-null-deref-in-sched_exec 2004-09-08 22:08:47.374591152 -0700 +++ 25-akpm/kernel/sched.c 2004-09-08 22:08:47.381590088 -0700 @@ -1727,8 +1727,8 @@ void sched_exec(void) if (tmp->flags & SD_BALANCE_EXEC) sd = tmp; - schedstat_inc(sd, sbe_attempts); if (sd) { + schedstat_inc(sd, sbe_attempts); new_cpu = find_idlest_cpu(current, this_cpu, sd); if (new_cpu != this_cpu) { schedstat_inc(sd, sbe_pushed); _