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Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/tty_io.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index d4b1a4824924..eb7bd80cd155 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -877,13 +877,20 @@ 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);