leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge branch 'tipc-uninit-values'

Browse Source 
Ying Xue says:

====================
tipc: fix uninit-value issues reported by syzbot

Recently, syzbot complained that TIPC module exits several issues
associated with uninit-value type. So, in this series, we try to
fix them as many as possible.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2019-01-15 20:29:21 -08:00
commit 70a44f9f6e
2 changed files with 50 additions and 2 deletions

50
net/tipc/netlink_compat.c
View File

@ -87,6 +87,11 @@ static int tipc_skb_tailroom(struct sk_buff *skb)
return limit;
}
static inline int TLV_GET_DATA_LEN(struct tlv_desc *tlv)
{
return TLV_GET_LEN(tlv) - TLV_SPACE(0);
}
static int tipc_add_tlv(struct sk_buff *skb, u16 type, void *data, u16 len)
{
struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(skb);
@ -166,6 +171,11 @@ static struct sk_buff *tipc_get_err_tlv(char *str)
return buf;
}
static inline bool string_is_valid(char *s, int len)
{
return memchr(s, '\0', len) ? true : false;
}
static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
struct tipc_nl_compat_msg *msg,
struct sk_buff *arg)
@ -379,6 +389,7 @@ static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
struct nlattr *prop;
struct nlattr *bearer;
struct tipc_bearer_config *b;
int len;
b = (struct tipc_bearer_config *)TLV_DATA(msg->req);
@ -386,6 +397,10 @@ static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
if (!bearer)
return -EMSGSIZE;
len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_BEARER_NAME);
if (!string_is_valid(b->name, len))
return -EINVAL;
if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
return -EMSGSIZE;
@ -411,6 +426,7 @@ static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
{
char *name;
struct nlattr *bearer;
int len;
name = (char *)TLV_DATA(msg->req);
@ -418,6 +434,10 @@ static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
if (!bearer)
return -EMSGSIZE;
len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_BEARER_NAME);
if (!string_is_valid(name, len))
return -EINVAL;
if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
return -EMSGSIZE;
@ -478,6 +498,7 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
struct nlattr *prop[TIPC_NLA_PROP_MAX + 1];
struct nlattr *stats[TIPC_NLA_STATS_MAX + 1];
int err;
int len;
if (!attrs[TIPC_NLA_LINK])
return -EINVAL;
@ -504,6 +525,11 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
return err;
name = (char *)TLV_DATA(msg->req);
len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_LINK_NAME);
if (!string_is_valid(name, len))
return -EINVAL;
if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
return 0;
@ -644,6 +670,7 @@ static int tipc_nl_compat_media_set(struct sk_buff *skb,
struct nlattr *prop;
struct nlattr *media;
struct tipc_link_config *lc;
int len;
lc = (struct tipc_link_config *)TLV_DATA(msg->req);
@ -651,6 +678,10 @@ static int tipc_nl_compat_media_set(struct sk_buff *skb,
if (!media)
return -EMSGSIZE;
len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_MEDIA_NAME);
if (!string_is_valid(lc->name, len))
return -EINVAL;
if (nla_put_string(skb, TIPC_NLA_MEDIA_NAME, lc->name))
return -EMSGSIZE;
@ -671,6 +702,7 @@ static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
struct nlattr *prop;
struct nlattr *bearer;
struct tipc_link_config *lc;
int len;
lc = (struct tipc_link_config *)TLV_DATA(msg->req);
@ -678,6 +710,10 @@ static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
if (!bearer)
return -EMSGSIZE;
len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_MEDIA_NAME);
if (!string_is_valid(lc->name, len))
return -EINVAL;
if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, lc->name))
return -EMSGSIZE;
@ -726,9 +762,14 @@ static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd,
struct tipc_link_config *lc;
struct tipc_bearer *bearer;
struct tipc_media *media;
int len;
lc = (struct tipc_link_config *)TLV_DATA(msg->req);
len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_LINK_NAME);
if (!string_is_valid(lc->name, len))
return -EINVAL;
media = tipc_media_find(lc->name);
if (media) {
cmd->doit = &__tipc_nl_media_set;
@ -750,6 +791,7 @@ static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
{
char *name;
struct nlattr *link;
int len;
name = (char *)TLV_DATA(msg->req);
@ -757,6 +799,10 @@ static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
if (!link)
return -EMSGSIZE;
len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_LINK_NAME);
if (!string_is_valid(name, len))
return -EINVAL;
if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
return -EMSGSIZE;
@ -778,6 +824,8 @@ static int tipc_nl_compat_name_table_dump_header(struct tipc_nl_compat_msg *msg)
};
ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
if (TLV_GET_DATA_LEN(msg->req) < sizeof(struct tipc_name_table_query))
return -EINVAL;
depth = ntohl(ntq->depth);
@ -1208,7 +1256,7 @@ static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
}
len = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
if (len && !TLV_OK(msg.req, len)) {
if (!len || !TLV_OK(msg.req, len)) {
msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
err = -EOPNOTSUPP;
goto send;

2
net/tipc/topsrv.c
View File

@ -398,7 +398,7 @@ static int tipc_conn_rcv_from_sock(struct tipc_conn *con)
ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT);
if (ret == -EWOULDBLOCK)
return -EWOULDBLOCK;
if (ret > 0) {
if (ret == sizeof(s)) {
read_lock_bh(&sk->sk_callback_lock);
ret = tipc_conn_rcv_sub(srv, con, &s);
read_unlock_bh(&sk->sk_callback_lock);