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authorSascha Silbe <silbe@linux.vnet.ibm.com>2016-09-20 19:09:07 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-10-31 04:14:00 -0600
commit9c72ae999e4f9c1619a154851aedbb35e1ad95f2 (patch)
treec944e5aa0edcf33c83290c436caa0cfa8b8e5601 /drivers/s390
parent8b477849186cbdc701a979460bad298a17f40649 (diff)
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/char/con3270.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index 3c3b49f15b1f..bae98521c808 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));
@@ -461,7 +466,7 @@ 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 {