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calipso: fix memory leak in netlbl_calipso_add_pass() 

If IPv6 support is disabled at boot (ipv6.disable=1),
the calipso_init() -> netlbl_calipso_ops_register() function isn't called,
and the netlbl_calipso_ops_get() function always returns NULL.
In this case, the netlbl_calipso_add_pass() function allocates memory
for the doi_def variable but doesn't free it with the calipso_doi_free().

BUG: memory leak
unreferenced object 0xffff888011d68180 (size 64):
  comm "syz-executor.1", pid 10746, jiffies 4295410986 (age 17.928s)
  hex dump (first 32 bytes):
    00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<...>] kmalloc include/linux/slab.h:552 [inline]
    [<...>] netlbl_calipso_add_pass net/netlabel/netlabel_calipso.c:76 [inline]
    [<...>] netlbl_calipso_add+0x22e/0x4f0 net/netlabel/netlabel_calipso.c:111
    [<...>] genl_family_rcv_msg_doit+0x22f/0x330 net/netlink/genetlink.c:739
    [<...>] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
    [<...>] genl_rcv_msg+0x341/0x5a0 net/netlink/genetlink.c:800
    [<...>] netlink_rcv_skb+0x14d/0x440 net/netlink/af_netlink.c:2515
    [<...>] genl_rcv+0x29/0x40 net/netlink/genetlink.c:811
    [<...>] netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
    [<...>] netlink_unicast+0x54b/0x800 net/netlink/af_netlink.c:1339
    [<...>] netlink_sendmsg+0x90a/0xdf0 net/netlink/af_netlink.c:1934
    [<...>] sock_sendmsg_nosec net/socket.c:651 [inline]
    [<...>] sock_sendmsg+0x157/0x190 net/socket.c:671
    [<...>] ____sys_sendmsg+0x712/0x870 net/socket.c:2342
    [<...>] ___sys_sendmsg+0xf8/0x170 net/socket.c:2396
    [<...>] __sys_sendmsg+0xea/0x1b0 net/socket.c:2429
    [<...>] do_syscall_64+0x30/0x40 arch/x86/entry/common.c:46
    [<...>] entry_SYSCALL_64_after_hwframe+0x61/0xc6

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with Syzkaller

Fixes: cb72d38211 ("netlabel: Initial support for the CALIPSO netlink protocol.")
Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru>
[PM: merged via the LSM tree at Jakub Kicinski request]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Gavrilov Ilia 2023-11-23 09:25:54 +00:00 committed by Paul Moore
parent 80b4ff1d2c
commit ec4e9d630a
1 changed files with 26 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
net/netlabel/netlabel_calipso.c
View File

@ -54,6 +54,28 @@ static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = {
[NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 },
};
static const struct netlbl_calipso_ops *calipso_ops;
/**
* netlbl_calipso_ops_register - Register the CALIPSO operations
* @ops: ops to register
*
* Description:
* Register the CALIPSO packet engine operations.
*
*/
const struct netlbl_calipso_ops *
netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
{
return xchg(&calipso_ops, ops);
}
EXPORT_SYMBOL(netlbl_calipso_ops_register);
static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
{
return READ_ONCE(calipso_ops);
}
/* NetLabel Command Handlers
*/
/**
@ -96,15 +118,18 @@ static int netlbl_calipso_add_pass(struct genl_info *info,
*
*/
static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct netlbl_audit audit_info;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
!info->attrs[NLBL_CALIPSO_A_MTYPE])
return -EINVAL;
if (!ops)
return -EOPNOTSUPP;
netlbl_netlink_auditinfo(&audit_info);
switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) {
case CALIPSO_MAP_PASS:
@ -363,28 +388,6 @@ int __init netlbl_calipso_genl_init(void)
return genl_register_family(&netlbl_calipso_gnl_family);
}
static const struct netlbl_calipso_ops *calipso_ops;
/**
* netlbl_calipso_ops_register - Register the CALIPSO operations
* @ops: ops to register
*
* Description:
* Register the CALIPSO packet engine operations.
*
*/
const struct netlbl_calipso_ops *
netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
{
return xchg(&calipso_ops, ops);
}
EXPORT_SYMBOL(netlbl_calipso_ops_register);
static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
{
return READ_ONCE(calipso_ops);
}
/**
* calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
* @doi_def: the DOI structure