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authorMichael S. Tsirkin <mst@redhat.com>2014-12-01 13:31:45 +0200
committerMichael S. Tsirkin <mst@redhat.com>2014-12-09 12:06:33 +0200
commit48b36066b48025b7cd7d46c9a879f2f72fd9086a (patch)
treed5a9f3eef7c7d4da573a7a671e34885043f55853 /drivers/char
parent2e73c716ba22b3b3df56be25132df2774967f2b1 (diff)
virtio_console: fix sparse warnings
CHECK drivers/char/virtio_console.c drivers/char/virtio_console.c:687:36: warning: incorrect type in argument 1 (different address spaces) drivers/char/virtio_console.c:687:36: expected void [noderef] <asn:1>*to drivers/char/virtio_console.c:687:36: got char *out_buf drivers/char/virtio_console.c:790:35: warning: incorrect type in argument 2 (different address spaces) drivers/char/virtio_console.c:790:35: expected char *out_buf drivers/char/virtio_console.c:790:35: got char [noderef] <asn:1>*ubuf fill_readbuf is reused with both kernel and userspace pointers, depending on value of to_user flag. Tag address parameter as __user, and cast to/from regular pointer type when we know it's safe. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/virtio_console.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 6cc832b45185..de03df9dd7c9 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -669,8 +669,8 @@ done:
* Give out the data that's requested from the buffer that we have
* queued up.
*/
-static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count,
- bool to_user)
+static ssize_t fill_readbuf(struct port *port, char __user *out_buf,
+ size_t out_count, bool to_user)
{
struct port_buffer *buf;
unsigned long flags;
@@ -688,7 +688,8 @@ static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count,
if (ret)
return -EFAULT;
} else {
- memcpy(out_buf, buf->buf + buf->offset, out_count);
+ memcpy((__force char *)out_buf, buf->buf + buf->offset,
+ out_count);
}
buf->offset += out_count;
@@ -1162,7 +1163,7 @@ static int get_chars(u32 vtermno, char *buf, int count)
/* If we don't have an input queue yet, we can't get input. */
BUG_ON(!port->in_vq);
- return fill_readbuf(port, buf, count, false);
+ return fill_readbuf(port, (__force char __user *)buf, count, false);
}
static void resize_console(struct port *port)