linux-kernel - [PATCH] dvb: fix potential format string leak

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Message-ID: <20130916233720.GA3967@www.outflux.net>
Date:	Mon, 16 Sep 2013 16:37:20 -0700
From:	Kees Cook <keescook@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org
Subject: [PATCH] dvb: fix potential format string leak

Make sure that a format string cannot accidentally leak into the printk
buffer.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/media/dvb-frontends/dib9000.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/dib9000.c b/drivers/media/dvb-frontends/dib9000.c
index 6201c59..61b2cfe 100644
--- a/drivers/media/dvb-frontends/dib9000.c
+++ b/drivers/media/dvb-frontends/dib9000.c
@@ -649,7 +649,7 @@ static int dib9000_risc_debug_buf(struct dib9000_state *state, u16 * data, u8 si
 	b[2 * (size - 2) - 1] = '\0';	/* Bullet proof the buffer */
 	if (*b == '~') {
 		b++;
-		dprintk(b);
+		dprintk("%s", b);
 	} else
 		dprintk("RISC%d: %d.%04d %s", state->fe_id, ts / 10000, ts % 10000, *b ? b : "<emtpy>");
 	return 1;
-- 
1.7.9.5


-- 
Kees Cook
Chrome OS Security
--
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