rpc: fix garbage in printk in svc_tcp_accept()

we upgraded the kernel of a nfs-server from 2.6.17.11 to 2.6.22.6. Since
then we get the message

lockd: too many open TCP sockets, consider increasing the number of nfsd threads
lockd: last TCP connect from ^\\236^\É^D

These random characters in the second line are caused by a bug in
svc_tcp_accept.

(Note: there are two previous __svc_print_addr(sin, buf, sizeof(buf))
calls in this function, either of which would initialize buf correctly;
but both are inside "if"'s and are not necessarily executed.  This is
less obvious in the second case, which is inside a dprintk(), which is a
macro which expands to an if statement.)

Signed-off-by: Wolfgang Walter <wolfgang.walter@studentenwerk.mhn.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 1a89992..036ab52 100644 (file)
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1110,7 +1110,8 @@ svc_tcp_accept(struct svc_sock *svsk)
                                                   serv->sv_name);
                                printk(KERN_NOTICE
                                       "%s: last TCP connect from %s\n",
-                                      serv->sv_name, buf);
+                                      serv->sv_name, __svc_print_addr(sin,
+                                                       buf, sizeof(buf)));
                        }
                        /*
                         * Always select the oldest socket. It's not fair,