ceph: fix printing of ipv6 addrs

The buffer was too small.  Make it bigger, use snprintf(), put brackets
around the ipv6 address to avoid mixing it up with the :port, and use the
ever-so-handy %pI[46] formats.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 6 insertions, 18 deletions

diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c
index 9692d08e2f88..e8c5a2d0e88f 100644
--- a/fs/ceph/messenger.c
+++ b/fs/ceph/messenger.c
@@ -43,7 +43,8 @@ static void ceph_fault(struct ceph_connection *con);
  * nicely render a sockaddr as a string.
  */
 #define MAX_ADDR_STR 20
-static char addr_str[MAX_ADDR_STR][40];
+#define MAX_ADDR_STR_LEN 60
+static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN];
 static DEFINE_SPINLOCK(addr_str_lock);
 static int last_addr_str;
 
@@ -52,7 +53,6 @@ const char *pr_addr(const struct sockaddr_storage *ss)
         int i;
         char *s;
         struct sockaddr_in *in4 = (void *)ss;
-        unsigned char *quad = (void *)&in4->sin_addr.s_addr;
         struct sockaddr_in6 *in6 = (void *)ss;
 
         spin_lock(&addr_str_lock);
@@ -64,25 +64,13 @@ const char *pr_addr(const struct sockaddr_storage *ss)
 
         switch (ss->ss_family) {
         case AF_INET:
-                sprintf(s, "%u.%u.%u.%u:%u",
-                        (unsigned int)quad[0],
-                        (unsigned int)quad[1],
-                        (unsigned int)quad[2],
-                        (unsigned int)quad[3],
-                        (unsigned int)ntohs(in4->sin_port));
+                snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%u", &in4->sin_addr,
+                         (unsigned int)ntohs(in4->sin_port));
                 break;
 
         case AF_INET6:
-                sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u",
-                        in6->sin6_addr.s6_addr16[0],
-                        in6->sin6_addr.s6_addr16[1],
-                        in6->sin6_addr.s6_addr16[2],
-                        in6->sin6_addr.s6_addr16[3],
-                        in6->sin6_addr.s6_addr16[4],
-                        in6->sin6_addr.s6_addr16[5],
-                        in6->sin6_addr.s6_addr16[6],
-                        in6->sin6_addr.s6_addr16[7],
-                        (unsigned int)ntohs(in6->sin6_port));
+                snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%u", &in6->sin6_addr,
+                         (unsigned int)ntohs(in6->sin6_port));
                 break;
 
         default: