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| author | Nathael Pajani <nathael.pajani@ed3l.fr> | 2010-09-02 14:06:16 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-09-04 00:29:04 (GMT) |
| commit | 6eb68d6f3bf1707d5d816ea9242b7d38f25b942e (patch) | |
| tree | 8b07c11557ac0b72105d5ecb538fb34335ee10eb | |
| parent | 336746918299f2ca16b31490655b4ff7c8824c87 (diff) | |
| download | linux-6eb68d6f3bf1707d5d816ea9242b7d38f25b942e.tar.xz | |
tty: fix tty_line must not be equal to number of allocated tty pointers in tty driver
I found a bug "by chance" in drivers/char/tty_io.c
I mean "by chance" because I was just reading the code of the
tty_find_polling_driver() to make a new tty_find_by_name() function.
In tty_find_polling_driver() the driver actually test "tty_line <=
p->num" while num refers to the number of struct tty_struct pointers
allocated for the p->ttys (p is a tty_driver), and tty_line is scanned
in a tty name, which can be for example ttyS2. Then tty_line equals 2.
And if p->num is 2, we have only p->ttys[0] and p->ttys[1], but no
p->ttys[2].
This is actually unharmful, for tty_find_polling_driver() is used only
in drivers/serial/kgdboc.c, and there's a test over there to find a
console with a matching index, which will never happen.
This is still a bug anyway.
Signed-off-by: Nathael Pajani <nathael.pajani@ed3l.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/char/tty_io.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index 949067a..613c852 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -355,7 +355,7 @@ struct tty_driver *tty_find_polling_driver(char *name, int *line) if (*stp == '\0') stp = NULL; - if (tty_line >= 0 && tty_line <= p->num && p->ops && + if (tty_line >= 0 && tty_line < p->num && p->ops && p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) { res = tty_driver_kref_get(p); *line = tty_line; |