Am Montag, den 05.08.2019, 05:38 -0700 schrieb syzbot: > Hello, > > syzbot found the following crash on: > > HEAD commit: e96407b4 usb-fuzzer: main usb gadget fuzzer driver > git tree: https://github.com/google/kasan.git usb-fuzzer > console output: https://syzkaller.appspot.com/x/log.txt?x=144c21dc600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e > dashboard link: https://syzkaller.appspot.com/bug?extid=94e2b9e9c7d1dd332345 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169e8542600000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10ec8262600000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+94e2b9e9c7d1dd332345@xxxxxxxxxxxxxxxxxxxxxxxxx > > usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, > different from the interface descriptor's value: 9 > usb 1-1: New USB device found, idVendor=046d, idProduct=c298, bcdDevice= > 0.00 > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 > usb 1-1: config 0 descriptor?? > logitech 0003:046D:C298.0001: unknown main item tag 0x0 > logitech 0003:046D:C298.0001: unknown main item tag 0x0 > logitech 0003:046D:C298.0001: hidraw0: USB HID v0.00 Device [HID 046d:c298] > on usb-dummy_hcd.0-1/input0 > BUG: KASAN: slab-out-of-bounds in set_bit > include/asm-generic/bitops-instrumented.h:28 [inline] #syz test: https://github.com/google/kasan.git e96407b4 >From 7e7f8ce9108b69613f8bb4ff2f95c258e22c3228 Mon Sep 17 00:00:00 2001 From: Oliver Neukum <oneukum@xxxxxxxx> Date: Mon, 5 Aug 2019 16:14:47 +0200 Subject: [PATCH] hid-lg4ff: sanity check for offsets of FF effects Malicious devices could provide huge offsets which would lead to setting bits in random kernel memory. Adding a sanity check. Reported-by: syzbot+94e2b9e9c7d1dd332345@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx> --- drivers/hid/hid-lg4ff.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c index cefba038520c..f9572750d889 100644 --- a/drivers/hid/hid-lg4ff.c +++ b/drivers/hid/hid-lg4ff.c @@ -1327,8 +1327,12 @@ int lg4ff_init(struct hid_device *hid) } /* Set supported force feedback capabilities */ + error = -ENODEV; for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++) - set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit); + if (lg4ff_devices[i].ff_effects[j] <= 15) + set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit); + else + goto err_init; error = input_ff_create_memless(dev, NULL, lg4ff_play); -- 2.16.4
