From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx49dKdxCCWgTOWDH+ae2zvhfD0Kfuz7WKA/JWUkKE8Wk2Lt5Q+TrmaDDpmh2QLfd3OP+HtaE ARC-Seal: i=1; a=rsa-sha256; t=1524406824; cv=none; d=google.com; s=arc-20160816; b=FKCgjOzmPJSkY0K5smE6sVtKb1WZ/LBcab6wtfoFUs+MGebEWIVS7VTLGz5F8+mo56 Lg6WZfq+Ao8YvapwsVsY0UDkOalMuBCWNf/MaRo2TcPNR9CE0v/Zjt9ZEDgLQMiDCcEu 11W/sDm+vR9RXs1f2LMZ4YYjD9lDEIR3on4HGfpfl3qExjjLMXC+jlqL2++DhhdmMpE0 RkFP/e1TOIwVEdqZ6Iann/2up15I2HJ1EXsdqofWdbMz78VRmlt50KI+xYgxyq5oV95P PnaLQXu5GPLmJ0BfC4/406Dr2axik5NSBgKMuz31+WRAobfhtb+H0EN3tIfnmVpiv+2t NcaA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=lUkU1/3pcCyj/OFrRfbkwFbYHCi4GeO5IgXbdVU/pjc=; b=RdO2XWvLfcc5sitgA5Q4o/umrB333mE3RqSJpnQenkFkLmUE2utxAuqvd5A9wf8962 y+b5cIEh4uKfgZIulK8jThffKPqyd8qYdaa8TIlVo90aLZOhpzqKRYFgKP5a635OBYkq czDN6TeOOf+zDAnpji0kq0WYYFgNeuwEVCisRFhYzkY5xhLKeeU1W9Ovs3WElW6fVSvb 6zZRZ1UaIJx2TsjCw33bdK8wJ+7T1sBkeKTPGYaBuqlbB/7tOVxvymlIPSniMOZrtubc wAjJ+SiP2iTsSwOWSvA0Hq4vbtjoj304kCgWuxZ3l1fjJYmdxsVxwCN9PVCXdXw6d53h 7Rdg== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Aaron Ma , Jiri Kosina Subject: [PATCH 3.18 18/52] HID: i2c-hid: fix size check and type usage Date: Sun, 22 Apr 2018 15:53:51 +0200 Message-Id: <20180422135316.112014588@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180422135315.254787616@linuxfoundation.org> References: <20180422135315.254787616@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1598455016186220261?= X-GMAIL-MSGID: =?utf-8?q?1598456410264375038?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Aaron Ma commit ac75a041048b8c1f7418e27621ca5efda8571043 upstream. When convert char array with signed int, if the inbuf[x] is negative then upper bits will be set to 1. Fix this by using u8 instead of char. ret_size has to be at least 3, hid_input_report use it after minus 2 bytes. Cc: stable@vger.kernel.org Signed-off-by: Aaron Ma Signed-off-by: Jiri Kosina Signed-off-by: Greg Kroah-Hartman --- drivers/hid/i2c-hid/i2c-hid.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -136,10 +136,10 @@ struct i2c_hid { * register of the HID * descriptor. */ unsigned int bufsize; /* i2c buffer size */ - char *inbuf; /* Input buffer */ - char *rawbuf; /* Raw Input buffer */ - char *cmdbuf; /* Command buffer */ - char *argsbuf; /* Command arguments buffer */ + u8 *inbuf; /* Input buffer */ + u8 *rawbuf; /* Raw Input buffer */ + u8 *cmdbuf; /* Command buffer */ + u8 *argsbuf; /* Command arguments buffer */ unsigned long flags; /* device flags */ @@ -373,7 +373,8 @@ static int i2c_hid_hwreset(struct i2c_cl static void i2c_hid_get_input(struct i2c_hid *ihid) { - int ret, ret_size; + int ret; + u32 ret_size; int size = le16_to_cpu(ihid->hdesc.wMaxInputLength); if (size > ihid->bufsize) @@ -398,7 +399,7 @@ static void i2c_hid_get_input(struct i2c return; } - if (ret_size > size) { + if ((ret_size > size) || (ret_size <= 2)) { dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n", __func__, size, ret_size); return;