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xfrm: convert alg_key to flexible array member 

Iproute2 build generates a warning when built with gcc-12.
This is because the alg_key in xfrm.h API has zero size
array element instead of flexible array.

    CC       xfrm_state.o
In function ‘xfrm_algo_parse’,
    inlined from ‘xfrm_state_modify.constprop’ at xfrm_state.c:573:5:
xfrm_state.c:162:32: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
  162 |                         buf[j] = val;
      |                         ~~~~~~~^~~~~

This patch convert the alg_key into flexible array member.
There are other zero size arrays here that should be converted as
well.

This patch is RFC only since it is only compile tested and
passes trivial iproute2 tests.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Stephen Hemminger 2022-05-24 13:47:40 -07:00 committed by Steffen Klassert
parent b5c8b3fe89
commit 924b290655
1 changed files with 3 additions and 3 deletions
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6
include/uapi/linux/xfrm.h
View File

@ -102,21 +102,21 @@ struct xfrm_replay_state_esn {
struct xfrm_algo {
char alg_name[64];
unsigned int alg_key_len; /* in bits */
char alg_key[0];
char alg_key[];
};
struct xfrm_algo_auth {
char alg_name[64];
unsigned int alg_key_len; /* in bits */
unsigned int alg_trunc_len; /* in bits */
char alg_key[0];
char alg_key[];
};
struct xfrm_algo_aead {
char alg_name[64];
unsigned int alg_key_len; /* in bits */
unsigned int alg_icv_len; /* in bits */
char alg_key[0];
char alg_key[];
};
struct xfrm_stats {