diff options
author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-20 07:59:14 -0600 |
---|---|---|
committer | Jozsef Kadlecsik <kadlec@netfilter.org> | 2020-09-20 12:26:15 +0200 |
commit | b62e1ef34c18c1734593b81de481021f8fbb866e (patch) | |
tree | 9a1b14d5701511561c2f46ea7d7b957d31e6d4f5 /kernel/net | |
parent | cc93f943de61ea552884c6b0ab2510136c4ac8f2 (diff) |
netfilter: Replace zero-length array 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
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
Lastly, fix checkpatch.pl warning
WARNING: __aligned(size) is preferred over __attribute__((aligned(size)))
in net/bridge/netfilter/ebtables.c
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>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Diffstat (limited to 'kernel/net')
-rw-r--r-- | kernel/net/netfilter/ipset/ip_set_bitmap_ip.c | 2 | ||||
-rw-r--r-- | kernel/net/netfilter/ipset/ip_set_bitmap_ipmac.c | 2 | ||||
-rw-r--r-- | kernel/net/netfilter/ipset/ip_set_bitmap_port.c | 2 | ||||
-rw-r--r-- | kernel/net/netfilter/ipset/ip_set_hash_gen.h | 4 |
4 files changed, 5 insertions, 5 deletions
diff --git a/kernel/net/netfilter/ipset/ip_set_bitmap_ip.c b/kernel/net/netfilter/ipset/ip_set_bitmap_ip.c index 4323ab0..c488663 100644 --- a/kernel/net/netfilter/ipset/ip_set_bitmap_ip.c +++ b/kernel/net/netfilter/ipset/ip_set_bitmap_ip.c @@ -48,7 +48,7 @@ struct bitmap_ip { #ifdef HAVE_TIMER_SETUP struct ip_set *set; /* attached to this ip_set */ #endif - unsigned char extensions[0] /* data extensions */ + unsigned char extensions[] /* data extensions */ __aligned(__alignof__(u64)); }; diff --git a/kernel/net/netfilter/ipset/ip_set_bitmap_ipmac.c b/kernel/net/netfilter/ipset/ip_set_bitmap_ipmac.c index 760bbf5..3d25d29 100644 --- a/kernel/net/netfilter/ipset/ip_set_bitmap_ipmac.c +++ b/kernel/net/netfilter/ipset/ip_set_bitmap_ipmac.c @@ -52,7 +52,7 @@ struct bitmap_ipmac { #ifdef HAVE_TIMER_SETUP struct ip_set *set; /* attached to this ip_set */ #endif - unsigned char extensions[0] /* MAC + data extensions */ + unsigned char extensions[] /* MAC + data extensions */ __aligned(__alignof__(u64)); }; diff --git a/kernel/net/netfilter/ipset/ip_set_bitmap_port.c b/kernel/net/netfilter/ipset/ip_set_bitmap_port.c index cf9f262..2a570d8 100644 --- a/kernel/net/netfilter/ipset/ip_set_bitmap_port.c +++ b/kernel/net/netfilter/ipset/ip_set_bitmap_port.c @@ -40,7 +40,7 @@ struct bitmap_port { #ifdef HAVE_TIMER_SETUP struct ip_set *set; /* attached to this ip_set */ #endif - unsigned char extensions[0] /* data extensions */ + unsigned char extensions[] /* data extensions */ __aligned(__alignof__(u64)); }; diff --git a/kernel/net/netfilter/ipset/ip_set_hash_gen.h b/kernel/net/netfilter/ipset/ip_set_hash_gen.h index 44ea2c1..cbc3e98 100644 --- a/kernel/net/netfilter/ipset/ip_set_hash_gen.h +++ b/kernel/net/netfilter/ipset/ip_set_hash_gen.h @@ -77,7 +77,7 @@ struct hbucket { DECLARE_BITMAP(used, AHASH_MAX_TUNED); u8 size; /* size of the array */ u8 pos; /* position of the first free entry */ - unsigned char value[0] /* the array of the values */ + unsigned char value[] /* the array of the values */ __aligned(__alignof__(u64)); }; @@ -110,7 +110,7 @@ struct htable { u8 htable_bits; /* size of hash table == 2^htable_bits */ u32 maxelem; /* Maxelem per region */ struct ip_set_region *hregion; /* Region locks and ext sizes */ - struct hbucket __rcu *bucket[0]; /* hashtable buckets */ + struct hbucket __rcu *bucket[]; /* hashtable buckets */ }; #define hbucket(h, i) ((h)->bucket[i]) |