From bbb9db5e2a7a1ca0926d26a279000384be21b789 Mon Sep 17 00:00:00 2001 From: Shyam Prasad N Date: Thu, 2 Dec 2021 07:46:54 +0000 Subject: [PATCH] cifs: avoid use of dstaddr as key for fscache client cookie server->dstaddr can change when the DNS mapping for the server hostname changes. But conn_id is a u64 counter that is incremented each time a new TCP connection is setup. So use only that as a key. Signed-off-by: Shyam Prasad N Reviewed-by: Paulo Alcantara (SUSE) Signed-off-by: Steve French --- fs/cifs/fscache.c | 38 +------------------------------------- 1 file changed, 1 insertion(+), 37 deletions(-) diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c index 1db3437..003c5f1 100644 --- a/fs/cifs/fscache.c +++ b/fs/cifs/fscache.c @@ -16,14 +16,6 @@ * Key layout of CIFS server cache index object */ struct cifs_server_key { - struct { - uint16_t family; /* address family */ - __be16 port; /* IP port */ - } hdr; - union { - struct in_addr ipv4_addr; - struct in6_addr ipv6_addr; - }; __u64 conn_id; } __packed; @@ -32,11 +24,7 @@ struct cifs_server_key { */ void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) { - const struct sockaddr *sa = (struct sockaddr *) &server->dstaddr; - const struct sockaddr_in *addr = (struct sockaddr_in *) sa; - const struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) sa; struct cifs_server_key key; - uint16_t key_len = sizeof(key.hdr); /* * Check if cookie was already initialized so don't reinitialize it. @@ -47,36 +35,12 @@ void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) return; memset(&key, 0, sizeof(key)); - - /* - * Should not be a problem as sin_family/sin6_family overlays - * sa_family field - */ - key.hdr.family = sa->sa_family; - switch (sa->sa_family) { - case AF_INET: - key.hdr.port = addr->sin_port; - key.ipv4_addr = addr->sin_addr; - key_len += sizeof(key.ipv4_addr); - break; - - case AF_INET6: - key.hdr.port = addr6->sin6_port; - key.ipv6_addr = addr6->sin6_addr; - key_len += sizeof(key.ipv6_addr); - break; - - default: - cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family); - server->fscache = NULL; - return; - } key.conn_id = server->conn_id; server->fscache = fscache_acquire_cookie(cifs_fscache_netfs.primary_index, &cifs_fscache_server_index_def, - &key, key_len, + &key, sizeof(key), NULL, 0, server, 0, true); cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", -- 2.7.4