From: Sean Young <sean@mess.org>
To: syzbot <syzbot+eaaaf38a95427be88f4b@syzkaller.appspotmail.com>
Cc: andreyknvl@google.com, hans.verkuil@cisco.com,
keescook@chromium.org, linux-kernel@vger.kernel.org,
linux-media@vger.kernel.org, linux-usb@vger.kernel.org,
mchehab@kernel.org, syzkaller-bugs@googlegroups.com
Subject: [PATCH] media: technisat-usb2: break out of loop at end of buffer
Date: Wed, 3 Jul 2019 15:52:39 +0100 [thread overview]
Message-ID: <20190703145239.ridwf2jegipnoxfz@gofer.mess.org> (raw)
In-Reply-To: <000000000000089d7f058683115e@google.com>
Ensure we do not access the buffer beyond the end if no 0xff byte
is encountered.
Reported-by: syzbot+eaaaf38a95427be88f4b@syzkaller.appspotmail.com
Signed-off-by: Sean Young <sean@mess.org>
---
drivers/media/usb/dvb-usb/technisat-usb2.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/media/usb/dvb-usb/technisat-usb2.c b/drivers/media/usb/dvb-usb/technisat-usb2.c
index c659e18b358b..676d233d46d5 100644
--- a/drivers/media/usb/dvb-usb/technisat-usb2.c
+++ b/drivers/media/usb/dvb-usb/technisat-usb2.c
@@ -608,10 +608,9 @@ static int technisat_usb2_frontend_attach(struct dvb_usb_adapter *a)
static int technisat_usb2_get_ir(struct dvb_usb_device *d)
{
struct technisat_usb2_state *state = d->priv;
- u8 *buf = state->buf;
- u8 *b;
- int ret;
struct ir_raw_event ev;
+ u8 *buf = state->buf;
+ int i, ret;
buf[0] = GET_IR_DATA_VENDOR_REQUEST;
buf[1] = 0x08;
@@ -647,26 +646,25 @@ static int technisat_usb2_get_ir(struct dvb_usb_device *d)
return 0; /* no key pressed */
/* decoding */
- b = buf+1;
#if 0
deb_rc("RC: %d ", ret);
- debug_dump(b, ret, deb_rc);
+ debug_dump(buf + 1, ret, deb_rc);
#endif
ev.pulse = 0;
- while (1) {
- ev.pulse = !ev.pulse;
- ev.duration = (*b * FIRMWARE_CLOCK_DIVISOR * FIRMWARE_CLOCK_TICK) / 1000;
- ir_raw_event_store(d->rc_dev, &ev);
-
- b++;
- if (*b == 0xff) {
+ for (i = 1; i < ARRAY_SIZE(state->buf); i++) {
+ if (buf[i] == 0xff) {
ev.pulse = 0;
ev.duration = 888888*2;
ir_raw_event_store(d->rc_dev, &ev);
break;
}
+
+ ev.pulse = !ev.pulse;
+ ev.duration = (buf[i] * FIRMWARE_CLOCK_DIVISOR *
+ FIRMWARE_CLOCK_TICK) / 1000;
+ ir_raw_event_store(d->rc_dev, &ev);
}
ir_raw_event_handle(d->rc_dev);
--
2.21.0
next prev parent reply other threads:[~2019-07-03 14:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-14 20:06 KASAN: slab-out-of-bounds Read in technisat_usb2_rc_query syzbot
2019-07-02 14:02 ` [PATCH] media: usb: technisat-usb2: fix buffer overflow Phong Tran
2019-07-02 14:23 ` Alexander Potapenko
2019-07-02 16:03 ` Kees Cook
2019-07-03 2:14 ` [PATCH V2] " Phong Tran
2019-07-03 2:26 ` Kees Cook
2019-07-03 14:52 ` Sean Young [this message]
2019-07-03 16:54 ` [PATCH] media: technisat-usb2: break out of loop at end of buffer Kees Cook
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