diff options
| -rw-r--r-- | drivers/tty/tty_io.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index d7883da7ba3d..88b4c4963461 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -861,13 +861,20 @@ static int iterate_tty_read(struct tty_ldisc *ld, struct tty_struct *tty, if (!size) break; - /* - * A ldisc read error return will override any previously copied - * data (eg -EOVERFLOW from HDLC) - */ if (size < 0) { - memzero_explicit(kernel_buf, sizeof(kernel_buf)); - return size; + /* Did we have an earlier error (ie -EFAULT)? */ + if (retval) + break; + retval = size; + + /* + * -EOVERFLOW means we didn't have enough space + * for a whole packet, and we shouldn't return + * a partial result. + */ + if (retval == -EOVERFLOW) + offset = 0; + break; } copied = copy_to_iter(kernel_buf, size, to); |