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authorAnirudh Rayabharam <mail@anirudhrb.com>2021-04-25 23:03:53 +0530
committerSasha Levin <sashal@kernel.org>2021-06-30 08:49:30 -0400
commitc5d3c142f2d57d40c55e65d5622d319125a45366 (patch)
tree79679822af6e75a1a1d55976d84757304d300f24 /drivers/hid
parentd6fbb33d29cddd61cccf7c647fb41feb6526cf44 (diff)
HID: usbhid: fix info leak in hid_submit_ctrl
[ Upstream commit 6be388f4a35d2ce5ef7dbf635a8964a5da7f799f ] In hid_submit_ctrl(), the way of calculating the report length doesn't take into account that report->size can be zero. When running the syzkaller reproducer, a report of size 0 causes hid_submit_ctrl) to calculate transfer_buffer_length as 16384. When this urb is passed to the usb core layer, KMSAN reports an info leak of 16384 bytes. To fix this, first modify hid_report_len() to account for the zero report size case by using DIV_ROUND_UP for the division. Then, call it from hid_submit_ctrl(). Reported-by: syzbot+7c2bb71996f95a82524c@syzkaller.appspotmail.com Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com> Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/usbhid/hid-core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index b0eeb5090c91..d51fc2be0e10 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -372,7 +372,7 @@ static int hid_submit_ctrl(struct hid_device *hid)
raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
dir = usbhid->ctrl[usbhid->ctrltail].dir;
- len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
+ len = hid_report_len(report);
if (dir == USB_DIR_OUT) {
usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
usbhid->urbctrl->transfer_buffer_length = len;