netdev - [PATCH bpf-next 09/14] bpf: add parenthesis around argument of BPF_LDST

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Message-Id: <20180329004839.4506-10-jakub.kicinski@netronome.com>
Date:   Wed, 28 Mar 2018 17:48:33 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     alexei.starovoitov@...il.com, daniel@...earbox.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        Jan Gossens <jan.gossens@...h-aachen.de>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH bpf-next 09/14] bpf: add parenthesis around argument of BPF_LDST_BYTES()

BPF_LDST_BYTES() does not put it's argument in parenthesis
when referencing it.  This makes it impossible to pass pointers
obtained by address-of operator (e.g. BPF_LDST_BYTES(&insn)).
Add the parenthesis.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>
---
 include/linux/filter.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 109d05ccea9a..c2f167db8bd5 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -372,7 +372,7 @@ struct xdp_rxq_info;
 
 #define BPF_LDST_BYTES(insn)					\
 	({							\
-		const int __size = bpf_size_to_bytes(BPF_SIZE(insn->code)); \
+		const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
 		WARN_ON(__size < 0);				\
 		__size;						\
 	})
-- 
2.16.2