On Fri, Aug 18, 2023 at 10:15:22PM +0530, coolrrsh@xxxxxxxxx wrote: > From: Rajeshwar R Shinde <coolrrsh@xxxxxxxxx> > > Syzkaller reported the following issue: > > UBSAN: shift-out-of-bounds in drivers/media/usb/gspca/cpia1.c:1031:27 > shift exponent 245 is too large for 32-bit type 'int' > CPU: 1 PID: 25 Comm: kworker/1:1 > Not tainted 6.5.0-rc4-syzkaller-00118-g55c3e571d2a0 #0 > Hardware name: > Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 > Workqueue: usb_hub_wq hub_event > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106 > ubsan_epilogue lib/ubsan.c:217 [inline] > __ubsan_handle_shift_out_of_bounds+0x27a/0x600 lib/ubsan.c:387 > set_flicker.cold+0x1b/0x20 drivers/media/usb/gspca/cpia1.c:1031 > sd_s_ctrl+0x2c6/0xbf0 drivers/media/usb/gspca/cpia1.c:1782 > __v4l2_ctrl_handler_setup+0x511/0x710 > drivers/media/v4l2-core/v4l2-ctrls-core.c:2481 > v4l2_ctrl_handler_setup > drivers/media/v4l2-core/v4l2-ctrls-core.c:2498 [inline] > v4l2_ctrl_handler_setup+0x50/0xa0 > drivers/media/v4l2-core/v4l2-ctrls-core.c:2490 > gspca_set_default_mode drivers/media/usb/gspca/gspca.c:908 [inline] > gspca_dev_probe2+0xdd6/0x1b20 drivers/media/usb/gspca/gspca.c:1541 > gspca_dev_probe+0x18b/0x270 drivers/media/usb/gspca/gspca.c:1610 > usb_probe_interface+0x307/0x930 drivers/usb/core/driver.c:396 > call_driver_probe drivers/base/dd.c:579 [inline] > really_probe+0x234/0xc90 drivers/base/dd.c:658 > __driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:798 > driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:828 > __device_attach_driver+0x1d4/0x300 drivers/base/dd.c:956 > bus_for_each_drv+0x157/0x1d0 drivers/base/bus.c:457 > __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1028 > bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532 > device_add+0x11f1/0x1b40 drivers/base/core.c:3625 > usb_set_configuration+0x10cb/0x1c40 drivers/usb/core/message.c:2207 > usb_generic_driver_probe+0xca/0x130 drivers/usb/core/generic.c:238 > usb_probe_device+0xda/0x2c0 drivers/usb/core/driver.c:293 > call_driver_probe drivers/base/dd.c:579 [inline] > really_probe+0x234/0xc90 drivers/base/dd.c:658 > __driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:798 > driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:828 > __device_attach_driver+0x1d4/0x300 drivers/base/dd.c:956 > bus_for_each_drv+0x157/0x1d0 drivers/base/bus.c:457 > __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1028 > bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532 > device_add+0x11f1/0x1b40 drivers/base/core.c:3625 > usb_new_device+0xd80/0x1960 drivers/usb/core/hub.c:2589 > hub_port_connect drivers/usb/core/hub.c:5440 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5580 [inline] > port_event drivers/usb/core/hub.c:5740 [inline] > hub_event+0x2e62/0x4f30 drivers/usb/core/hub.c:5822 > process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597 > process_scheduled_works kernel/workqueue.c:2664 [inline] > worker_thread+0x896/0x1110 kernel/workqueue.c:2750 > kthread+0x33a/0x430 kernel/kthread.c:389 > ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 > ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 > </TASK> > > shift-out-of-bounds error was triggered when sd->params.exposure.gain > is right shifted beyond the bit range of int. Therefore added the > conditional check before the shift operation. > > Tested via syzbot. > > Reported-by: syzbot+e27f3dbdab04e43b9f73@xxxxxxxxxxxxxxxxxxxxxxxxx > > dashboard link: https://syzkaller.appspot.com/bug?extid=e27f3dbdab04e43b9f73 > > Signed-off-by: Rajeshwar R Shinde <coolrrsh@xxxxxxxxx> > --- > drivers/media/usb/gspca/cpia1.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/media/usb/gspca/cpia1.c b/drivers/media/usb/gspca/cpia1.c > index 46ed95483e22..bb22be99ea8c 100644 > --- a/drivers/media/usb/gspca/cpia1.c > +++ b/drivers/media/usb/gspca/cpia1.c > @@ -1028,7 +1028,9 @@ static int set_flicker(struct gspca_dev *gspca_dev, int on, int apply) > sd->params.exposure.expMode = 2; > sd->exposure_status = EXPOSURE_NORMAL; > } > + if(sd->params.exposure.gain < 32){ > currentexp = currentexp << sd->params.exposure.gain; > + } > sd->params.exposure.gain = 0; > /* round down current exposure to nearest value */ > startexp = (currentexp + ROUND_UP_EXP_FOR_FLICKER) / cj; Always run scripts/checkpatch.pl on your change to prevent grumpy mantainers and bots from asking why you didn't run scripts/checkpatch.pl on your change.
