s390/con3270: fix insufficient space padding

commit 6cd997db911f28f2510b771691270c52b63ed2e6 upstream.

con3270 contains an optimisation that reduces the amount of data to be
transmitted to the 3270 terminal by putting a Repeat to Address (RA)
order into the data stream. The RA order itself takes up space, so
con3270 only uses it if there's enough space left in the line
buffer. Otherwise it just pads out the line manually.

For lines that were _just_ short enough that the RA order still fit in
the line buffer, the line was instead padded with an insufficient
amount of spaces. This was caused by examining the size of the
allocated line buffer rather than the length of the string to be
displayed.

For con3270_cline_end(), we just compare against the line length. For
con3270_update_string() however that isn't available anymore, so we
check whether the Repeat to Address order is present.

Fixes: f51320a5 ("[PATCH] s390: new 3270 driver.") (tglx/history.git)
Tested-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
Tested-by: Yang Chen <bjcyang@linux.vnet.ibm.com>
Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index 8c1edbdde3e5851202e38f8423fb3463d51fe0bc..a64875385cbfdfa121c82881ba8df8c213e15c0e 100644 (file)
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -124,7 +124,12 @@ con3270_create_status(struct con3270 *cp)
 static void
 con3270_update_string(struct con3270 *cp, struct string *s, int nr)
 {
-       if (s->len >= cp->view.cols - 5)
+       if (s->len < 4) {
+               /* This indicates a bug, but printing a warning would
+                * cause a deadlock. */
+               return;
+       }
+       if (s->string[s->len - 4] != TO_RA)
                return;
        raw3270_buffer_address(cp->view.dev, s->string + s->len - 3,
                               cp->view.cols * (nr + 1));
@@ -457,7 +462,7 @@ con3270_cline_end(struct con3270 *cp)
                cp->cline->len + 4 : cp->view.cols;
        s = con3270_alloc_string(cp, size);
        memcpy(s->string, cp->cline->string, cp->cline->len);
-       if (s->len < cp->view.cols - 5) {
+       if (cp->cline->len < cp->view.cols - 5) {
                s->string[s->len - 4] = TO_RA;
                s->string[s->len - 1] = 0;
        } else {