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Message-Id: <20180415092352.12403-1-jolsa@kernel.org> Date: Sun, 15 Apr 2018 11:23:50 +0200 From: Jiri Olsa <jolsa@...nel.org> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>, Andi Kleen <andi@...stfloor.org>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, hpa@...or.com, Namhyung Kim <namhyung@...nel.org>, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org Subject: [PATCH 1/3] perf: Return proper values for user stack errors Return immediately when we find issue in the user stack checks. The error value could get overwritten by following check for PERF_SAMPLE_REGS_INTR. Signed-off-by: Jiri Olsa <jolsa@...nel.org> --- kernel/events/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index fc1c330c6bd6..4d997bc064d2 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10191,9 +10191,9 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr, * __u16 sample size limit. */ if (attr->sample_stack_user >= USHRT_MAX) - ret = -EINVAL; + return -EINVAL; else if (!IS_ALIGNED(attr->sample_stack_user, sizeof(u64))) - ret = -EINVAL; + return -EINVAL; } if (!attr->sample_max_stack) -- 2.13.6
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