[PATCH] fix slab-out-of-bounds in betopff_init function
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From: F.A.Sulaiman <hidden>
Date: 2021-08-15 08:32:28
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Subsystem:
hid core layer, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
This patch resolves the bug 'KASAN: slab-out-of-bounds Write in betop_probe' reported by Syzbot. Patch resolve the bug by checking hid_device's hid_input is non empty before it's been used. Signed-off-by: F.A. SULAIMAN <redacted> --- drivers/hid/hid-betopff.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/hid/hid-betopff.c b/drivers/hid/hid-betopff.c
index 0790fbd3fc9a..6a1f894b0e97 100644
--- a/drivers/hid/hid-betopff.c
+++ b/drivers/hid/hid-betopff.c@@ -56,19 +56,20 @@ static int betopff_init(struct hid_device *hid) { struct betopff_device *betopff; struct hid_report *report; - struct hid_input *hidinput = - list_first_entry(&hid->inputs, struct hid_input, list); + struct hid_input *hidinput; struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; - struct input_dev *dev = hidinput->input; + struct input_dev *dev; int field_count = 0; int error; int i, j; - if (list_empty(report_list)) { + if (list_empty(&hid->inputs)) { hid_err(hid, "no output reports found\n"); return -ENODEV; } + hidinput = list_entry(hid->inputs.next, struct hid_input, list); + dev = hidinput->input; report = list_first_entry(report_list, struct hid_report, list); /*
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2.17.1