net: check type when freeing metadata dst

Commit 3fcece12bc1b ("net: store port/representator id in metadata_dst")
added a new type field to metadata_dst, but metadata_dst_free() wasn't
updated to check it before freeing the METADATA_IP_TUNNEL specific dst
cache entry.

This is not currently causing problems since it's far enough back in the
struct to be zeroed for the only other type currently in existance
(METADATA_HW_PORT_MUX), but nevertheless it's not correct.

Fixes: 3fcece12bc1b ("net: store port/representator id in metadata_dst")
Signed-off-by: David Lamparter <equinox@diac24.net>
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>
Cc: Sridhar Samudrala <sridhar.samudrala@intel.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dst.c b/net/core/dst.c
index d6ead757c25895da01eb61bc9636c7e9b3cdfb3e..a6c47da7d0f8bf8a871c73aaedc21360712e03b2 100644 (file)
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -299,7 +299,8 @@ EXPORT_SYMBOL_GPL(metadata_dst_alloc);
 void metadata_dst_free(struct metadata_dst *md_dst)
 {
 #ifdef CONFIG_DST_CACHE
-       dst_cache_destroy(&md_dst->u.tun_info.dst_cache);
+       if (md_dst->type == METADATA_IP_TUNNEL)
+               dst_cache_destroy(&md_dst->u.tun_info.dst_cache);
 #endif
        kfree(md_dst);
 }