Patch "tty: vt: fix up tabstops properly" has been added to the 4.9-stable tree

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This is a note to let you know that I've just added the patch titled

    tty: vt: fix up tabstops properly

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tty-vt-fix-up-tabstops-properly.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From f1869a890cdedb92a3fab969db5d0fd982850273 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Sat, 24 Mar 2018 10:43:26 +0100
Subject: tty: vt: fix up tabstops properly

From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

commit f1869a890cdedb92a3fab969db5d0fd982850273 upstream.

Tabs on a console with long lines do not wrap properly, so correctly
account for the line length when computing the tab placement location.

Reported-by: James Holderness <j4_james@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/tty/vt/vt.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1727,7 +1727,7 @@ static void reset_terminal(struct vc_dat
 	default_attr(vc);
 	update_attr(vc);
 
-	vc->vc_tab_stop[0]	= 0x01010100;
+	vc->vc_tab_stop[0]	=
 	vc->vc_tab_stop[1]	=
 	vc->vc_tab_stop[2]	=
 	vc->vc_tab_stop[3]	=
@@ -1771,7 +1771,7 @@ static void do_con_trol(struct tty_struc
 		vc->vc_pos -= (vc->vc_x << 1);
 		while (vc->vc_x < vc->vc_cols - 1) {
 			vc->vc_x++;
-			if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
+			if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
 				break;
 		}
 		vc->vc_pos += (vc->vc_x << 1);
@@ -1831,7 +1831,7 @@ static void do_con_trol(struct tty_struc
 			lf(vc);
 			return;
 		case 'H':
-			vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
+			vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
 			return;
 		case 'Z':
 			respond_ID(tty);
@@ -2024,7 +2024,7 @@ static void do_con_trol(struct tty_struc
 			return;
 		case 'g':
 			if (!vc->vc_par[0])
-				vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
+				vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
 			else if (vc->vc_par[0] == 3) {
 				vc->vc_tab_stop[0] =
 					vc->vc_tab_stop[1] =


Patches currently in stable-queue which might be from torvalds@xxxxxxxxxxxxxxxxxxxx are

queue-4.9/mm-khugepaged.c-convert-vm_bug_on-to-collapse-fail.patch
queue-4.9/tty-vt-fix-up-tabstops-properly.patch
queue-4.9/selftests-x86-ptrace_syscall-fix-for-yet-more-glibc-interference.patch
queue-4.9/mm-thp-do-not-wait-for-lock_page-in-deferred_split_scan.patch
queue-4.9/mm-vmalloc-add-interfaces-to-free-unmapped-page-table.patch
queue-4.9/kvm-x86-fix-icebp-instruction-handling.patch
queue-4.9/mm-shmem-do-not-wait-for-lock_page-in-shmem_unused_huge_shrink.patch
queue-4.9/x86-mm-implement-free-pmd-pte-page-interfaces.patch



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