ALSA: core: memalloc: add page alignment for iram

commit 74c64efa1557fef731b59eb813f115436d18078e upstream.

Since mmap for userspace is based on page alignment, add page alignment
for iram alloc from pool, otherwise, some good data located in the same
page of dmab->area maybe touched wrongly by userspace like pulseaudio.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1608221747-3474-1-git-send-email-yibin.gong@nxp.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 0aeeb62..0f33516 100644 (file)
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -77,7 +77,8 @@ static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
        /* Assign the pool into private_data field */
        dmab->private_data = pool;
 
-       dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
+       dmab->area = gen_pool_dma_alloc_align(pool, size, &dmab->addr,
+                                       PAGE_SIZE);
 }
 
 /**