ALSA: echoaudio: Fix memory allocation

'commpage_bak' is allocated with 'sizeof(struct echoaudio)' bytes.
We then copy 'sizeof(struct comm_page)' bytes in it.
On my system, smatch complains because one is 2960 and the other is 3072.

This would result in memory corruption or a oops.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index 1cb85aeb0cea..286f5e3686a3 100644
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -2200,11 +2200,11 @@ static int snd_echo_resume(struct device *dev)
         u32 pipe_alloc_mask;
         int err;
 
-        commpage_bak = kmalloc(sizeof(struct echoaudio), GFP_KERNEL);
+        commpage_bak = kmalloc(sizeof(*commpage), GFP_KERNEL);
         if (commpage_bak == NULL)
                 return -ENOMEM;
         commpage = chip->comm_page;
-        memcpy(commpage_bak, commpage, sizeof(struct comm_page));
+        memcpy(commpage_bak, commpage, sizeof(*commpage));
 
         err = init_hw(chip, chip->pci->device, chip->pci->subsystem_device);
         if (err < 0) {