| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 151/155] media: ov519: add missing endpoint sanity checks | Date | Tue, 31 Mar 2020 10:59:51 +0200 |
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From: Johan Hovold <johan@kernel.org>
commit 998912346c0da53a6dbb71fab3a138586b596b30 upstream.
Make sure to check that we have at least one endpoint before accessing the endpoint array to avoid dereferencing a NULL-pointer on stream start.
Note that these sanity checks are not redundant as the driver is mixing looking up altsettings by index and by number, which need not coincide.
Fixes: 1876bb923c98 ("V4L/DVB (12079): gspca_ov519: add support for the ov511 bridge") Fixes: b282d87332f5 ("V4L/DVB (12080): gspca_ov519: Fix ov518+ with OV7620AE (Trust spacecam 320)") Cc: stable <stable@vger.kernel.org> # 2.6.31 Cc: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/media/usb/gspca/ov519.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
--- a/drivers/media/usb/gspca/ov519.c +++ b/drivers/media/usb/gspca/ov519.c @@ -3477,6 +3477,11 @@ static void ov511_mode_init_regs(struct return; } + if (alt->desc.bNumEndpoints < 1) { + sd->gspca_dev.usb_err = -ENODEV; + return; + } + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); reg_w(sd, R51x_FIFO_PSIZE, packet_size >> 5); @@ -3603,6 +3608,11 @@ static void ov518_mode_init_regs(struct return; } + if (alt->desc.bNumEndpoints < 1) { + sd->gspca_dev.usb_err = -ENODEV; + return; + } + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); ov518_reg_w32(sd, R51x_FIFO_PSIZE, packet_size & ~7, 2);
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