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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-11 21:53:56 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-02-17 03:33:00 +0100 |
| commit | 1f4c51de3361f3d9223f7662b9567844e9fb7ca8 (patch) | |
| tree | 4d4c628d7e223aed6d8eb8aec5330cb876dedb00 /lib/objagg.c | |
| parent | ptp_qoriq: drop the code of alarm (diff) | |
| download | linux-1f4c51de3361f3d9223f7662b9567844e9fb7ca8.tar.xz linux-1f4c51de3361f3d9223f7662b9567844e9fb7ca8.zip | |
lib: objagg: Replace zero-length arrays with flexible-array member
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertenly introduced[3] to the codebase from now on.
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/objagg.c')
| -rw-r--r-- | lib/objagg.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/objagg.c b/lib/objagg.c index 55621fb82e0a..5e1676ccdadd 100644 --- a/lib/objagg.c +++ b/lib/objagg.c @@ -28,7 +28,7 @@ struct objagg_hints_node { struct objagg_hints_node *parent; unsigned int root_id; struct objagg_obj_stats_info stats_info; - unsigned long obj[0]; + unsigned long obj[]; }; static struct objagg_hints_node * @@ -66,7 +66,7 @@ struct objagg_obj { * including nested objects */ struct objagg_obj_stats stats; - unsigned long obj[0]; + unsigned long obj[]; }; static unsigned int objagg_obj_ref_inc(struct objagg_obj *objagg_obj) |