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hid: asus: asus_report_fixup: fix potential read out of bounds

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syzbot reported a potential read out of bounds in asus_report_fixup.

this patch adds checks so that a read out of bounds will not occur

Signed-off-by: Andrew Ballance <andrewjballance@gmail.com>
Reported-by:  <syzbot+07762f019fd03d01f04c@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=07762f019fd03d01f04c
Fixes: 59d2f5b739 ("HID: asus: fix more n-key report descriptors if n-key quirked")
Link: https://lore.kernel.org/r/20240602085023.1720492-1-andrewjballance@gmail.com
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Andrew Ballance 2024-06-02 03:50:23 -05:00 committed by Benjamin Tissoires
parent 9c8f05cf1d
commit 89e1ee118d
1 changed files with 2 additions and 2 deletions
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4
drivers/hid/hid-asus.c
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@ -1204,8 +1204,8 @@ static __u8 *asus_report_fixup(struct hid_device *hdev, __u8 *rdesc,
}
/* match many more n-key devices */
if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD) {
for (int i = 0; i < *rsize + 1; i++) {
if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && *rsize > 15) {
for (int i = 0; i < *rsize - 15; i++) {
/* offset to the count from 0x5a report part always 14 */
if (rdesc[i] == 0x85 && rdesc[i + 1] == 0x5a &&
rdesc[i + 14] == 0x95 && rdesc[i + 15] == 0x05) {