sound: oss: midi_synth: check get_user() return value

get_user() may fail, if so return -EFAULT.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/oss/midi_synth.c b/sound/oss/midi_synth.c
index 3bc7104c5379..3c09374ea5bf 100644
--- a/sound/oss/midi_synth.c
+++ b/sound/oss/midi_synth.c
@@ -523,7 +523,9 @@ midi_synth_load_patch(int dev, int format, const char __user *addr,
         {
                 unsigned char   data;
 
-                get_user(*(unsigned char *) &data, (unsigned char __user *) &((addr)[hdr_size + i]));
+                if (get_user(data,
+                    (unsigned char __user *)(addr + hdr_size + i)))
+                        return -EFAULT;
 
                 eox_seen = (i > 0 && data & 0x80);      /* End of sysex */