[PATCH] smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer

Free it in ksmbd_alloc_user() (the only function that uses it).

kmemleak splat:
  unreferenced object 0xffff888103b83540 (size 192):
    comm "pool-0", pid 16970, jiffies 4377290937
    hex dump (first 32 bytes):
      00 00 00 00 01 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 (crc 408ccc66):
      __kvmalloc_node_noprof+0x730/0x920
      handle_generic_event+0xec/0x1a0 [ksmbd]
      genl_family_rcv_msg_doit+0xe0/0x130
      genl_rcv_msg+0x181/0x290
      netlink_rcv_skb+0x4f/0x100
      genl_rcv+0x28/0x40
      netlink_unicast+0x1e6/0x2c0
      netlink_sendmsg+0x20a/0x450
      ____sys_sendmsg+0x2e8/0x310
      ___sys_sendmsg+0x78/0xc0
      __sys_sendmsg+0x63/0xc0
      do_syscall_64+0xa1/0x670
      entry_SYSCALL_64_after_hwframe+0x76/0x7e

Fixes: a77e0e02af1c ("ksmbd: add support for supplementary groups")
Signed-off-by: Enzo Matsumiya <[email protected]>
---
 fs/smb/server/mgmt/user_config.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/smb/server/mgmt/user_config.c b/fs/smb/server/mgmt/user_config.c
index cf45841d9d1b..2319c6cc67da 100644
--- a/fs/smb/server/mgmt/user_config.c
+++ b/fs/smb/server/mgmt/user_config.c
@@ -66,12 +66,14 @@ struct ksmbd_user *ksmbd_alloc_user(struct ksmbd_login_response *resp,
 		ksmbd_debug(SMB, "supplementary groups : %d\n", user->ngroups);
 	}
 
+	kfree(resp_ext);
 	return user;
 
 err_free:
 	kfree(user->name);
 	kfree(user->passkey);
 	kfree(user);
+	kfree(resp_ext);
 	return NULL;
 }
 
-- 
2.54.0