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phonet: fix building with clang

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clang warns about overflowing the data[] member in the struct pnpipehdr:

net/phonet/pep.c:295:8: warning: array index 4 is past the end of the array (which contains 1 element) [-Warray-bounds]
                        if (hdr->data[4] == PEP_IND_READY)
                            ^         ~
include/net/phonet/pep.h:66:3: note: array 'data' declared here
                u8              data[1];

Using a flexible array member at the end of the struct avoids the
warning, but since we cannot have a flexible array member inside
of the union, each index now has to be moved back by one, which
makes it a little uglier.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Rémi Denis-Courmont <remi@remlab.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann
2019-02-19 22:53:50 +01:00
committed by David S. Miller
parent b35560e485
commit 6321aa1975
2 changed files with 19 additions and 18 deletions
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5
include/net/phonet/pep.h
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@@ -63,10 +63,11 @@ struct pnpipehdr {
u8 state_after_reset; /* reset request */
u8 error_code; /* any response */
u8 pep_type; /* status indication */
u8 data[1];
u8 data0; /* anything else */
};
u8 data[];
};
#define other_pep_type data[1]
#define other_pep_type data[0]
static inline struct pnpipehdr *pnp_hdr(struct sk_buff *skb)
{