usb: gadget: Zero ffs_io_data

In some cases the "Allocate & copy" block in ffs_epfile_io() is not
executed. Consequently, in such a case ffs_alloc_buffer() is never called
and struct ffs_io_data is not initialized properly. This in turn leads to
problems when ffs_free_buffer() is called at the end of ffs_epfile_io().

This patch uses kzalloc() instead of kmalloc() in the aio case and memset()
in non-aio case to properly initialize struct ffs_io_data.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index c7ed90084d1a54faa2b4e7f3d45f7a8fafaa9afe..213ff03c8a9f0b9879c0b229d7aa3ced192160d7 100644 (file)
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -1183,11 +1183,12 @@ static ssize_t ffs_epfile_write_iter(struct kiocb *kiocb, struct iov_iter *from)
        ENTER();
 
        if (!is_sync_kiocb(kiocb)) {
-               p = kmalloc(sizeof(io_data), GFP_KERNEL);
+               p = kzalloc(sizeof(io_data), GFP_KERNEL);
                if (unlikely(!p))
                        return -ENOMEM;
                p->aio = true;
        } else {
+               memset(p, 0, sizeof(*p));
                p->aio = false;
        }
 
@@ -1219,11 +1220,12 @@ static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to)
        ENTER();
 
        if (!is_sync_kiocb(kiocb)) {
-               p = kmalloc(sizeof(io_data), GFP_KERNEL);
+               p = kzalloc(sizeof(io_data), GFP_KERNEL);
                if (unlikely(!p))
                        return -ENOMEM;
                p->aio = true;
        } else {
+               memset(p, 0, sizeof(*p));
                p->aio = false;
        }