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cipso: fix total option length computation

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[ Upstream commit 9f36169912331fa035d7b73a91252d7c2512eb1a ]

As evident from the definition of ip_options_get(), the IP option
IPOPT_END is used to pad the IP option data array, not IPOPT_NOP. Yet
the loop that walks the IP options to determine the total IP options
length in cipso_v4_delopt() doesn't take IPOPT_END into account.

Fix it by recognizing the IPOPT_END value as the end of actual options.

Fixes: 014ab19a69c3 ("selinux: Set socket NetLabel based on connection endpoint")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ondrej Mosnacek 2024-06-07 18:07:52 +02:00 • committed by Ksawlii
parent 17b33806ae
commit 031f88d6e9
1 changed files with 8 additions and 4 deletions
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12
net/ipv4/cipso_ipv4.c
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@ -2016,12 +2016,16 @@ static int cipso_v4_delopt(struct ip_options_rcu __rcu **opt_ptr)
* from there we can determine the new total option length */
iter = 0;
optlen_new = 0;
while (iter < opt->opt.optlen)
if (opt->opt.__data[iter] != IPOPT_NOP) {
while (iter < opt->opt.optlen) {
if (opt->opt.__data[iter] == IPOPT_END) {
break;
} else if (opt->opt.__data[iter] == IPOPT_NOP) {
iter++;
} else {
iter += opt->opt.__data[iter + 1];
optlen_new = iter;
} else
iter++;
}
}
hdr_delta = opt->opt.optlen;
opt->opt.optlen = (optlen_new + 3) & ~3;
hdr_delta -= opt->opt.optlen;