net: filter: Use WARN_RATELIMIT

[ Upstream commit 6c4a5cb219520c7bc937ee186ca53f03733bd09f ]

A mis-configured filter can spam the logs with lots of stack traces.

Rate-limit the warnings and add printout of the bogus filter information.

Original-patch-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/core/filter.c b/net/core/filter.c
index 01273978fe2ecfa25b5d0d2428c8bf6a721a80b2..d162169b88fd0bbec4b7c114d4d322ae26a21b50 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -291,7 +291,9 @@ load_b:
                        mem[f_k] = X;
                        continue;
                default:
-                       WARN_ON(1);
+                       WARN_RATELIMIT(1, "Unknown code:%u jt:%u tf:%u k:%u\n",
+                                      fentry->code, fentry->jt,
+                                      fentry->jf, fentry->k);
                        return 0;
                }