net: off by one in inet6_pton()

If "scope_len" is sizeof(scope_id) then we would put the NUL terminator
one space beyond the end of the buffer.

Fixes: b1a951fe469e ("net/utils: generic inet_pton_with_scope helper")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/core/utils.c b/net/core/utils.c
index f96cf527bb8f..32c467cf52d6 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -339,7 +339,7 @@ static int inet6_pton(struct net *net, const char *src, u16 port_num,
             src + srclen != scope_delim && *scope_delim == '%') {
                 struct net_device *dev;
                 char scope_id[16];
-                size_t scope_len = min_t(size_t, sizeof(scope_id),
+                size_t scope_len = min_t(size_t, sizeof(scope_id) - 1,
                                          src + srclen - scope_delim - 1);
 
                 memcpy(scope_id, scope_delim + 1, scope_len);