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tty vt: fix character insertion overflow 

Commit 81732c3b2f ("tty vt: Fix line garbage in virtual console on
command line edition") broke insert_char() in multiple ways.  Then
commit b1a925f44a ("tty vt: Fix a regression in command line edition")
partially fixed it.  However, the buffer being moved is still too large
and overflowing beyond the end of the current line, corrupting existing
characters on the next line.

Example test case:

echo -e "abc\nde\x1b[A\x1b[4h \x1b[4l\x1b[B"

Expected result:

ab c
de

Current result:

ab c
 e

Needless to say that this is very annoying when inserting words in the
middle of paragraphs with certain text editors.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Cc: Jean-François Moine <moinejf@free.fr>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nicolas Pitre 2013-02-24 20:06:09 -05:00 committed by Linus Torvalds
parent 77be36de8b
commit a883b70d8e
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/vt/vt.c
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@ -539,7 +539,7 @@ static void insert_char(struct vc_data *vc, unsigned int nr)
{
unsigned short *p = (unsigned short *) vc->vc_pos;
scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x) * 2);
scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
vc->vc_need_wrap = 0;
if (DO_UPDATE(vc))