6.6-stable review patch. If anyone has any objections, please let me know.
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From: Namjae Jeon linkinjeon@kernel.org
commit a89f5fae998bdc4d0505306f93844c9ae059d50c upstream.
free_transport function for tcp connection can be called from smbdirect. It will cause kernel oops. This patch add free_transport ops in ksmbd connection, and add each free_transports for tcp and smbdirect.
Fixes: 21a4e47578d4 ("ksmbd: fix use-after-free in __smb2_lease_break_noti()") Reviewed-by: Stefan Metzmacher metze@samba.org Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/smb/server/connection.c | 2 +- fs/smb/server/connection.h | 1 + fs/smb/server/transport_rdma.c | 10 ++++++++-- fs/smb/server/transport_tcp.c | 3 ++- 4 files changed, 12 insertions(+), 4 deletions(-)
--- a/fs/smb/server/connection.c +++ b/fs/smb/server/connection.c @@ -40,7 +40,7 @@ void ksmbd_conn_free(struct ksmbd_conn * kvfree(conn->request_buf); kfree(conn->preauth_info); if (atomic_dec_and_test(&conn->refcnt)) { - ksmbd_free_transport(conn->transport); + conn->transport->ops->free_transport(conn->transport); kfree(conn); } } --- a/fs/smb/server/connection.h +++ b/fs/smb/server/connection.h @@ -132,6 +132,7 @@ struct ksmbd_transport_ops { void *buf, unsigned int len, struct smb2_buffer_desc_v1 *desc, unsigned int desc_len); + void (*free_transport)(struct ksmbd_transport *kt); };
struct ksmbd_transport { --- a/fs/smb/server/transport_rdma.c +++ b/fs/smb/server/transport_rdma.c @@ -158,7 +158,8 @@ struct smb_direct_transport { };
#define KSMBD_TRANS(t) ((struct ksmbd_transport *)&((t)->transport)) - +#define SMBD_TRANS(t) ((struct smb_direct_transport *)container_of(t, \ + struct smb_direct_transport, transport)) enum { SMB_DIRECT_MSG_NEGOTIATE_REQ = 0, SMB_DIRECT_MSG_DATA_TRANSFER @@ -409,6 +410,11 @@ err: return NULL; }
+static void smb_direct_free_transport(struct ksmbd_transport *kt) +{ + kfree(SMBD_TRANS(kt)); +} + static void free_transport(struct smb_direct_transport *t) { struct smb_direct_recvmsg *recvmsg; @@ -455,7 +461,6 @@ static void free_transport(struct smb_di
smb_direct_destroy_pools(t); ksmbd_conn_free(KSMBD_TRANS(t)->conn); - kfree(t); }
static struct smb_direct_sendmsg @@ -2301,4 +2306,5 @@ static struct ksmbd_transport_ops ksmbd_ .read = smb_direct_read, .rdma_read = smb_direct_rdma_read, .rdma_write = smb_direct_rdma_write, + .free_transport = smb_direct_free_transport, }; --- a/fs/smb/server/transport_tcp.c +++ b/fs/smb/server/transport_tcp.c @@ -93,7 +93,7 @@ static struct tcp_transport *alloc_trans return t; }
-void ksmbd_free_transport(struct ksmbd_transport *kt) +static void ksmbd_tcp_free_transport(struct ksmbd_transport *kt) { struct tcp_transport *t = TCP_TRANS(kt);
@@ -659,4 +659,5 @@ static struct ksmbd_transport_ops ksmbd_ .read = ksmbd_tcp_read, .writev = ksmbd_tcp_writev, .disconnect = ksmbd_tcp_disconnect, + .free_transport = ksmbd_tcp_free_transport, };