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net: initialize msg.msg_flags in recvfrom 

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>
This commit is contained in:
Alexander Potapenko 2017-03-08 18:08:16 +01:00 committed by David S. Miller
parent 8ddbb3124d
commit 9f138fa609
1 changed files with 1 additions and 0 deletions
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net/socket.c
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@ -1731,6 +1731,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
/* We assume all kernel code knows the size of sockaddr_storage */ /* We assume all kernel code knows the size of sockaddr_storage */
msg.msg_namelen = 0; msg.msg_namelen = 0;
msg.msg_iocb = NULL; msg.msg_iocb = NULL;
msg.msg_flags = 0;
if (sock->file->f_flags & O_NONBLOCK) if (sock->file->f_flags & O_NONBLOCK)
flags |= MSG_DONTWAIT; flags |= MSG_DONTWAIT;
err = sock_recvmsg(sock, &msg, flags); err = sock_recvmsg(sock, &msg, flags);