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staging: speakup: fix misuse of kstrtol() in handle_goto()

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A string of goto_buf has a number followed by x or y.
e.g. "3x" means move 3 lines down.
The kstrtol() returns an error(-EINVAL) with this string so
go_pos has unsigned a value of that error.
And also "*cp" has not expected value.

And fix sparse warnings:
 drivers/staging/speakup/main.c:1901 handle_goto() warn: unsigned '(speakup_console[vc->vc_num]->go_pos)' is never less than zero.
 drivers/staging/speakup/main.c:1911 handle_goto() warn: unsigned '(speakup_console[vc->vc_num]->go_pos)' is never less than zero.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daeseok Youn 2014-04-09 19:45:46 +09:00 committed by Greg Kroah-Hartman
parent ff8ebe6448
commit ef35a4f44b
1 changed files with 9 additions and 9 deletions
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18
drivers/staging/speakup/main.c
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@ -1855,8 +1855,9 @@ static int handle_goto(struct vc_data *vc, u_char type, u_char ch, u_short key)
{
static u_char goto_buf[8];
static int num;
int maxlen, go_pos;
int maxlen;
char *cp;
if (type == KT_SPKUP && ch == SPEAKUP_GOTO)
goto do_goto;
if (type == KT_LATIN && ch == '\n')
@ -1891,25 +1892,24 @@ oops:
spk_special_handler = NULL;
return 1;
}
go_pos = kstrtol(goto_buf, 10, (long *)&cp);
goto_pos = (u_long) go_pos;
goto_pos = simple_strtoul(goto_buf, &cp, 10);
if (*cp == 'x') {
if (*goto_buf < '0')
goto_pos += spk_x;
else
else if (goto_pos > 0)
goto_pos--;
if (goto_pos < 0)
goto_pos = 0;
if (goto_pos >= vc->vc_cols)
goto_pos = vc->vc_cols - 1;
goto_x = 1;
} else {
if (*goto_buf < '0')
goto_pos += spk_y;
else
else if (goto_pos > 0)
goto_pos--;
if (goto_pos < 0)
goto_pos = 0;
if (goto_pos >= vc->vc_rows)
goto_pos = vc->vc_rows - 1;
goto_x = 0;