diff options
| -rw-r--r-- | drivers/media/dvb-core/dvb_ringbuffer.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/media/dvb-core/dvb_ringbuffer.c b/drivers/media/dvb-core/dvb_ringbuffer.c index 0d44deed65bd..8ab60a4fec00 100644 --- a/drivers/media/dvb-core/dvb_ringbuffer.c +++ b/drivers/media/dvb-core/dvb_ringbuffer.c @@ -233,9 +233,11 @@ ssize_t dvb_ringbuffer_write_user(struct dvb_ringbuffer *rbuf, */ smp_store_release(&rbuf->pwrite, 0); } - status = copy_from_user(rbuf->data+rbuf->pwrite, buf, todo); - if (status) - return len - todo; + + if (copy_from_user(rbuf->data + rbuf->pwrite, buf, todo)) { + smp_store_release(&rbuf->pwrite, oldpwrite); + return -EFAULT; + } /* smp_store_release() for write pointer update, see above */ smp_store_release(&rbuf->pwrite, (rbuf->pwrite + todo) % rbuf->size); |