From: Alexander Potapenko glider@google.com
This patch has been added to the stable tree. If you have any objections, please let us know.
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[ 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@microsoft.com --- net/socket.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/socket.c b/net/socket.c index 8327df0448f4..12d681c1b66d 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1706,6 +1706,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, /* 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, iov_iter_count(&msg.msg_iter), flags);