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Date: Sat, 04 Aug 2018 17:08:56 -0700 (PDT) From: David Miller <davem@...emloft.net> To: dima@...sta.com Cc: linux-kernel@...r.kernel.org, natechancellor@...il.com, herbert@...dor.apana.org.au, steffen.klassert@...unet.com, netdev@...r.kernel.org, stable@...r.kernel.org Subject: Re: [PATCH] netlink: Don't shift on 64 for ngroups From: Dmitry Safonov <dima@...sta.com> Date: Sun, 5 Aug 2018 00:55:44 +0100 > @@ -1011,8 +1011,8 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr, > > if (nlk->ngroups == 0) > groups = 0; > - else > - groups &= (1ULL << nlk->ngroups) - 1; > + else if (nlk->ngroups < sizeof(long unsigned int)) > + groups &= (1UL << nlk->ngroups) - 1; Sizeof is in bytes, you want to compare against bits.
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