From: Andrzej Pietrasiewicz andrzej.p@collabora.com
[ Upstream commit 508595515f4bcfe36246e4a565cf280937aeaade ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/gadget/function/f_fs.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 4800bb22cdd6..4cb1355271ec 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -912,11 +912,12 @@ 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; }
@@ -948,11 +949,12 @@ 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; }