ALSA: core: memalloc: add page alignment for iram

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>

diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 0aeeb6244ff6c513259567be9ee7214f97d2e4a4..0f335162f87c710760f7efa3f85a9185dcd8b2d1 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);
 }
 
 /**