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    Subject[PATCH 4.9 030/177] net: initialize msg.msg_flags in recvfrom
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Alexander Potapenko <glider@google.com>


    [ Upstream commit 9f138fa609c47403374a862a08a41394be53d461 ]

    KMSAN reports a use of uninitialized memory in put_cmsg() because
    msg.msg_flags in recvfrom haven't been initialized properly.
    The flag values don't affect the result on this path, but it's still a
    good idea to initialize them explicitly.

    Signed-off-by: Alexander Potapenko <glider@google.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/socket.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/net/socket.c
    +++ b/net/socket.c
    @@ -1702,6 +1702,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void
    /* We assume all kernel code knows the size of sockaddr_storage */
    msg.msg_namelen = 0;
    msg.msg_iocb = NULL;
    + msg.msg_flags = 0;
    if (sock->file->f_flags & O_NONBLOCK)
    flags |= MSG_DONTWAIT;
    err = sock_recvmsg(sock, &msg, flags);

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