From: Sascha Silbe Date: Tue, 20 Sep 2016 17:09:07 +0000 (+0200) Subject: s390/con3270: fix insufficient space padding X-Git-Tag: v4.9-rc1~132^2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6cd997db911f28f2510b771691270c52b63ed2e6;p=karo-tx-linux.git s390/con3270: fix insufficient space padding 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 Tested-by: Yang Chen Signed-off-by: Sascha Silbe Signed-off-by: Martin Schwidefsky --- diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c index 0c161dbec73d..285b4006f44b 100644 --- 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)); @@ -460,7 +465,7 @@ 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 {