From: Takashi Sakamoto Date: Tue, 13 Sep 2016 10:37:53 +0000 (+0900) Subject: ALSA: seq: fix to copy from/to user space X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=69b05825e1f883d15d3d051d0eab3171e247ecaa;p=linux-beck.git ALSA: seq: fix to copy from/to user space When checking value of request for copy operation, current implementation compares shifted value to macros, while these macros are already shifted. As a result, it never performs to copy from/to user space. This commit fixes the bug. Fixes: 8ce8eb601c71('ALSA: seq: add an alternative way to handle ioctl requests' Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai --- diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c index 811b95b6f6fd..4c935202ce23 100644 --- a/sound/core/seq/seq_clientmgr.c +++ b/sound/core/seq/seq_clientmgr.c @@ -2122,7 +2122,7 @@ static long snd_seq_ioctl(struct file *file, unsigned int cmd, * within 13 bits. We can safely pick up the size from the command. */ size = _IOC_SIZE(handler->cmd); - if (_IOC_DIR(handler->cmd) & IOC_IN) { + if (handler->cmd & IOC_IN) { if (copy_from_user(&buf, (const void __user *)arg, size)) return -EFAULT; } @@ -2132,7 +2132,7 @@ static long snd_seq_ioctl(struct file *file, unsigned int cmd, /* Some commands includes a bug in 'dir' field. */ if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT || handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL || - (_IOC_DIR(handler->cmd) & IOC_OUT)) + (handler->cmd & IOC_OUT)) if (copy_to_user((void __user *)arg, &buf, size)) return -EFAULT; }