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sched/core: Fix buffer overflow in cgroup2 property cpu.max

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[ Upstream commit 4c47acd824aaaa8fc6dc519fb4e08d1522105b7a ]

Add limit into sscanf format string for on-stack buffer.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 0d5936344f ("sched: Implement interface for cgroup unified hierarchy")
Link: https://lkml.kernel.org/r/155189230232.2620.13120481613524200065.stgit@buzz
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Konstantin Khlebnikov 2019-03-06 20:11:42 +03:00 • committed by Greg Kroah-Hartman
parent a8c1de3ab8
commit 52466ab203
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/core.c
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@ -6930,7 +6930,7 @@ static int __maybe_unused cpu_period_quota_parse(char *buf,
{
char tok[21]; /* U64_MAX */
if (!sscanf(buf, "%s %llu", tok, periodp))
if (sscanf(buf, "%20s %llu", tok, periodp) < 1)
return -EINVAL;
*periodp *= NSEC_PER_USEC;