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authorDmitry Safonov <dima@arista.com>2018-09-04 00:40:51 +0300
committerDavid S. Miller <davem@davemloft.net>2018-09-06 08:11:33 +0300
commit428f944bd58607021b5a1f85d145c0b50f908c6f (patch)
tree9eb7a6c61b82a4a901ab728317ce3cf39fbcbd6b /net/netlink
parentfa788d986a3aac5069378ed04697bd06f83d3488 (diff)
downloadlinux-428f944bd58607021b5a1f85d145c0b50f908c6f.tar.xz
netlink: Make groups check less stupid in netlink_bind()
As Linus noted, the test for 0 is needless, groups type can follow the usual kernel style and 8*sizeof(unsigned long) is BITS_PER_LONG: > The code [..] isn't technically incorrect... > But it is stupid. > Why stupid? Because the test for 0 is pointless. > > Just doing > if (nlk->ngroups < 8*sizeof(groups)) > groups &= (1UL << nlk->ngroups) - 1; > > would have been fine and more understandable, since the "mask by shift > count" already does the right thing for a ngroups value of 0. Now that > test for zero makes me go "what's special about zero?". It turns out > that the answer to that is "nothing". [..] > The type of "groups" is kind of silly too. > > Yeah, "long unsigned int" isn't _technically_ wrong. But we normally > call that type "unsigned long". Cleanup my piece of pointlessness. Cc: "David S. Miller" <davem@davemloft.net> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: netdev@vger.kernel.org Fairly-blamed-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink')
-rw-r--r--net/netlink/af_netlink.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 930d17fa906c..b4a29bcc33b9 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -993,7 +993,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
struct netlink_sock *nlk = nlk_sk(sk);
struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr;
int err = 0;
- long unsigned int groups = nladdr->nl_groups;
+ unsigned long groups = nladdr->nl_groups;
bool bound;
if (addr_len < sizeof(struct sockaddr_nl))
@@ -1011,9 +1011,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
return err;
}
- if (nlk->ngroups == 0)
- groups = 0;
- else if (nlk->ngroups < 8*sizeof(groups))
+ if (nlk->ngroups < BITS_PER_LONG)
groups &= (1UL << nlk->ngroups) - 1;
bound = nlk->bound;