diff options
| author | Debin Zhu <mowenroot@163.com> | 2025-04-01 20:40:18 +0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-04-02 16:01:04 -0700 |
| commit | 078aabd567de3d63d37d7673f714e309d369e6e2 (patch) | |
| tree | 97882b9eba5687bc500a6fa0c92ea0dfffdd501a /net | |
| parent | acc4d5ff0b61eb1715c498b6536c38c1feb7f3c1 (diff) | |
netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets
When calling netlbl_conn_setattr(), addr->sa_family is used
to determine the function behavior. If sk is an IPv4 socket,
but the connect function is called with an IPv6 address,
the function calipso_sock_setattr() is triggered.
Inside this function, the following code is executed:
sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
Since sk is an IPv4 socket, pinet6 is NULL, leading to a
null pointer dereference.
This patch fixes the issue by checking if inet6_sk(sk)
returns a NULL pointer before accessing pinet6.
Signed-off-by: Debin Zhu <mowenroot@163.com>
Signed-off-by: Bitao Ouyang <1985755126@qq.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Fixes: ceba1832b1b2 ("calipso: Set the calipso socket label to match the secattr.")
Link: https://patch.msgid.link/20250401124018.4763-1-mowenroot@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/calipso.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c index dbcea9fee626..62618a058b8f 100644 --- a/net/ipv6/calipso.c +++ b/net/ipv6/calipso.c @@ -1072,8 +1072,13 @@ static int calipso_sock_getattr(struct sock *sk, struct ipv6_opt_hdr *hop; int opt_len, len, ret_val = -ENOMSG, offset; unsigned char *opt; - struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk)); + struct ipv6_pinfo *pinfo = inet6_sk(sk); + struct ipv6_txoptions *txopts; + + if (!pinfo) + return -EAFNOSUPPORT; + txopts = txopt_get(pinfo); if (!txopts || !txopts->hopopt) goto done; @@ -1125,8 +1130,13 @@ static int calipso_sock_setattr(struct sock *sk, { int ret_val; struct ipv6_opt_hdr *old, *new; - struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk)); + struct ipv6_pinfo *pinfo = inet6_sk(sk); + struct ipv6_txoptions *txopts; + + if (!pinfo) + return -EAFNOSUPPORT; + txopts = txopt_get(pinfo); old = NULL; if (txopts) old = txopts->hopopt; @@ -1153,8 +1163,13 @@ static int calipso_sock_setattr(struct sock *sk, static void calipso_sock_delattr(struct sock *sk) { struct ipv6_opt_hdr *new_hop; - struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk)); + struct ipv6_pinfo *pinfo = inet6_sk(sk); + struct ipv6_txoptions *txopts; + + if (!pinfo) + return; + txopts = txopt_get(pinfo); if (!txopts || !txopts->hopopt) goto done; |