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Subject[patch 26/30] Char: isicom, fix close bug
-stable review patch.  If anyone has any objections, please let us know.
From: Jiri Slaby <>

[PATCH] Char: isicom, fix close bug

port is dereferenced even if it is NULL. Dereference it _after_ the
check if (!port)... Thanks Eric <> for reporting this.
This fixes

Signed-off-by: Jiri Slaby <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Chris Wright <>
drivers/char/isicom.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- linux-
+++ linux-
@@ -1062,11 +1062,12 @@ static void isicom_shutdown_port(struct
static void isicom_close(struct tty_struct *tty, struct file *filp)
struct isi_port *port = tty->driver_data;
- struct isi_board *card = port->card;
+ struct isi_board *card;
unsigned long flags;

if (!port)
+ card = port->card;
if (isicom_paranoia_check(port, tty->name, "isicom_close"))

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