Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  ALSA: pcm: Don't setup bogus iov_iter for silencing  At transition to the iov_iter for PCM data transfer, we blindly applied the iov_iter setup also for silencing (i.e. data = NULL), and it leads to a calculation of bogus iov_iter.  Fortunately this didn't cause troubles on most of architectures but it goes wrong on RISC-V now, causing a NULL dereference.  Handle the NULL data case to treat the silencing in interleaved_copy() for addressing the bug above.  noninterleaved_copy() has already the NULL data handling, so it doesn't need changes.