net: sendmsg: fix NULL pointer dereference

[karo-tx-linux.git] / net / core / iovec.c

diff --git a/net/core/iovec.c b/net/core/iovec.c
index 827dd6beb49c4c70adc2960f1b3046eb48a03574..e1ec45ab1e63c6909073691907c80e57bac89643 100644 (file)
--- a/net/core/iovec.c
+++ b/net/core/iovec.c
@@ -39,7 +39,7 @@ int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *a
 {
        int size, ct, err;
 
-       if (m->msg_namelen) {
+       if (m->msg_name && m->msg_namelen) {
                if (mode == VERIFY_READ) {
                        void __user *namep;
                        namep = (void __user __force *) m->msg_name;
@@ -48,10 +48,10 @@ int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *a
                        if (err < 0)
                                return err;
                }
-               if (m->msg_name)
-                       m->msg_name = address;
+               m->msg_name = address;
        } else {
                m->msg_name = NULL;
+               m->msg_namelen = 0;
        }
 
        size = m->msg_iovlen * sizeof(struct iovec);