[PATCH -next] ALSA: Fix oversized kvmalloc() calls

[Bixuan Cui]

The commit 7661809d493b ("mm: don't allow oversized kvmalloc()
calls") limits the max allocatable memory via kvzalloc() to MAX_INT.

Reported-by: syzbot+bb348e9f9a954d42746f at syzkaller.appspotmail.com
Signed-off-by: Bixuan Cui <cuibixuan at linux.alibaba.com>
---
 sound/core/oss/pcm_plugin.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/core/oss/pcm_plugin.c b/sound/core/oss/pcm_plugin.c
index 061ba06..61fccb5 100644
--- a/sound/core/oss/pcm_plugin.c
+++ b/sound/core/oss/pcm_plugin.c
@@ -68,6 +68,10 @@ static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t
 	size /= 8;
 	if (plugin->buf_frames < frames) {
 		kvfree(plugin->buf);
+
+		if (size > INT_MAX)
+			return -ENOMEM;
+
 		plugin->buf = kvzalloc(size, GFP_KERNEL);
 		plugin->buf_frames = frames;
 	}
-- 
1.8.3.1