netdev - [PATCH net] bpf: fix u64_stats_init() usage in bpf_prog

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Date:   Fri,  1 Mar 2019 14:33:11 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        bpf <bpf@...r.kernel.org>, Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH net] bpf: fix u64_stats_init() usage in bpf_prog_alloc()

We need to iterate through all possible cpus.

Fixes: 492ecee892c2 ("bpf: enable program stats")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Guenter Roeck <linux@...ck-us.net>
Tested-by: Guenter Roeck <linux@...ck-us.net>
---
 kernel/bpf/core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 1c14c347f3cfe1f7c0cf8a7eccff8135b16df81f..3f08c257858e1570339cd64a6351824bcc332ee3 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -109,6 +109,7 @@ struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags)
 {
 	gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | gfp_extra_flags;
 	struct bpf_prog *prog;
+	int cpu;
 
 	prog = bpf_prog_alloc_no_stats(size, gfp_extra_flags);
 	if (!prog)
@@ -121,7 +122,12 @@ struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags)
 		return NULL;
 	}
 
-	u64_stats_init(&prog->aux->stats->syncp);
+	for_each_possible_cpu(cpu) {
+		struct bpf_prog_stats *pstats;
+
+		pstats = per_cpu_ptr(prog->aux->stats, cpu);
+		u64_stats_init(&pstats->syncp);
+	}
 	return prog;
 }
 EXPORT_SYMBOL_GPL(bpf_prog_alloc);
-- 
2.21.0.352.gf09ad66450-goog