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| author | Xin Long <lucien.xin@gmail.com> | 2019-03-31 17:50:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-02 10:58:57 +0300 |
| commit | a0cb0faa15f3174ac0d1c5ca401ca80b4494b21d (patch) | |
| tree | dcf84b81b4370f7ec4d9eb52af2ed64a16767d79 | |
| parent | f21fae8049cd50d3873db21762f75a7bf950f7d2 (diff) | |
| download | linux-a0cb0faa15f3174ac0d1c5ca401ca80b4494b21d.tar.xz | |
tipc: check link name with right length in tipc_nl_compat_link_set
commit 8c63bf9ab4be8b83bd8c34aacfd2f1d2c8901c8a upstream.
A similar issue as fixed by Patch "tipc: check bearer name with right
length in tipc_nl_compat_bearer_enable" was also found by syzbot in
tipc_nl_compat_link_set().
The length to check with should be 'TLV_GET_DATA_LEN(msg->req) -
offsetof(struct tipc_link_config, name)'.
Reported-by: syzbot+de00a87b8644a582ae79@syzkaller.appspotmail.com
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/tipc/netlink_compat.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c index d093964e6354..588d5aa14c41 100644 --- a/net/tipc/netlink_compat.c +++ b/net/tipc/netlink_compat.c @@ -777,7 +777,12 @@ static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd, lc = (struct tipc_link_config *)TLV_DATA(msg->req); - len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_LINK_NAME); + len = TLV_GET_DATA_LEN(msg->req); + len -= offsetof(struct tipc_link_config, name); + if (len <= 0) + return -EINVAL; + + len = min_t(int, len, TIPC_MAX_LINK_NAME); if (!string_is_valid(lc->name, len)) return -EINVAL; |