printk: ipv4 address digits printed in reverse order

put_dec_trunc prints the digits in reverse order and is reversed
inside number(). Continue using put_dec_trunc, but reverse each quad
in ip4_addr_string.

[Noticed by Julius Volz]

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index dd7cc7fa3e77eb760e2404e4923510edd4ba350a..6897724ff5df0731e717305afaaca37112ec5897 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -620,11 +620,15 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
                         int precision, int flags)
 {
        char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
+       char temp[3];   /* hold each IP quad in reverse order */
        char *p = ip4_addr;
-       int i;
+       int i, digits;
 
        for (i = 0; i < 4; i++) {
-               p = put_dec_trunc(p, addr[i]);
+               digits = put_dec_trunc(temp, addr[i]) - temp;
+               /* reverse the digits in the quad */
+               while (digits--)
+                       *p++ = temp[digits];
                if (i != 3)
                        *p++ = '.';
        }