sched/fair: Null terminate buffer when updating tunable_scaling
This patch null-terminates the temporary buffer in sched_scaling_write() so kstrtouint() does not return failure and checks the value is valid. Before: $ cat /sys/kernel/debug/sched/tunable_scaling 1 $ echo 0 > /sys/kernel/debug/sched/tunable_scaling -bash: echo: write error: Invalid argument $ cat /sys/kernel/debug/sched/tunable_scaling 1 After: $ cat /sys/kernel/debug/sched/tunable_scaling 1 $ echo 0 > /sys/kernel/debug/sched/tunable_scaling $ cat /sys/kernel/debug/sched/tunable_scaling 0 $ echo 3 > /sys/kernel/debug/sched/tunable_scaling -bash: echo: write error: Invalid argument Fixes: 8a99b683 ("sched: Move SCHED_DEBUG sysctl to debugfs") Signed-off-by:Mel Gorman <mgorman@techsingularity.net> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by:
Vincent Guittot <vincent.guittot@linaro.org> Link: https://lore.kernel.org/r/20210927114635.GH3959@techsingularity.net
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