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| author | Mans Rullgard <mans@mansr.com> | 2018-12-05 14:52:47 +0100 |
|---|---|---|
| committer | Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> | 2018-12-21 21:27:21 +0100 |
| commit | 9bc30ab82108e6a34dc63bf956b49edf71b1681a (patch) | |
| tree | 9f48273fc6e90ce8d11fdf88c2b8500f29ff205b /drivers/auxdisplay/charlcd.c | |
| parent | Linux 4.20-rc6 (diff) | |
| download | linux-9bc30ab82108e6a34dc63bf956b49edf71b1681a.tar.xz linux-9bc30ab82108e6a34dc63bf956b49edf71b1681a.zip | |
auxdisplay: charlcd: fix x/y command parsing
The x/y command parsing has been broken since commit 129957069e6a
("staging: panel: Fixed checkpatch warning about simple_strtoul()").
Commit b34050fadb86 ("auxdisplay: charlcd: Fix and clean up handling of
x/y commands") fixed some problems by rewriting the parsing code,
but also broke things further by removing the check for a complete
command before attempting to parse it. As a result, parsing is
terminated at the first x or y character.
This reinstates the check for a final semicolon. Whereas the original
code use strchr(), this is wasteful seeing as the semicolon is always
at the end of the buffer. Thus check this character directly instead.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Diffstat (limited to 'drivers/auxdisplay/charlcd.c')
| -rw-r--r-- | drivers/auxdisplay/charlcd.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c index 81c22d20d9d9..60e0b772673f 100644 --- a/drivers/auxdisplay/charlcd.c +++ b/drivers/auxdisplay/charlcd.c @@ -538,6 +538,9 @@ static inline int handle_lcd_special_code(struct charlcd *lcd) } case 'x': /* gotoxy : LxXXX[yYYY]; */ case 'y': /* gotoxy : LyYYY[xXXX]; */ + if (priv->esc_seq.buf[priv->esc_seq.len - 1] != ';') + break; + /* If the command is valid, move to the new address */ if (parse_xy(esc, &priv->addr.x, &priv->addr.y)) charlcd_gotoxy(lcd); |