[PATCH] uml: line.c: avoid NULL pointer dereference

[Alexander Beregalov]

Assign tty only if line is not NULL.

Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Signed-off-by: Alexander Beregalov <a.beregalov@xxxxxxxxx>
---
 arch/um/drivers/line.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index cf8a97f..4a46253 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -18,10 +18,12 @@ static irqreturn_t line_interrupt(int irq, void *data)
 {
 	struct chan *chan = data;
 	struct line *line = chan->line;
-	struct tty_struct *tty = line->tty;
+	struct tty_struct *tty;
 
-	if (line)
+	if (line) {
+		tty = line->tty;
 		chan_interrupt(&line->chan_list, &line->task, tty, irq);
+	}
 	return IRQ_HANDLED;
 }
 
-- 
1.6.6

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/