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authorDavid Herrmann <dh.herrmann@gmail.com>2013-12-19 12:09:32 +0100
committerJiri Kosina <jkosina@suse.cz>2014-02-17 21:17:55 +0100
commita4b1b5877b514b276f0f31efe02388a9c2836728 (patch)
treea09dd741c0a2b98db2ab8f71b45c5dc92efcc02c /net/bluetooth/hidp
parent218eb9ed840c6279686ed6b0c3e31a083e241ff9 (diff)
HID: Bluetooth: hidp: make sure input buffers are big enough
HID core expects the input buffers to be at least of size 4096 (HID_MAX_BUFFER_SIZE). Other sizes will result in buffer-overflows if an input-report is smaller than advertised. We could, like i2c, compute the biggest report-size instead of using HID_MAX_BUFFER_SIZE, but this will blow up if report-descriptors are changed after ->start() has been called. So lets be safe and just use the biggest buffer we have. Note that this adds an additional copy to the HIDP input path. If there is a way to make sure the skb-buf is big enough, we should use that instead. The best way would be to make hid-core honor the @size argument, though, that sounds easier than it is. So lets just fix the buffer-overflows for now and afterwards look for a faster way for all transport drivers. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'net/bluetooth/hidp')
-rw-r--r--net/bluetooth/hidp/core.c16
-rw-r--r--net/bluetooth/hidp/hidp.h4
2 files changed, 18 insertions, 2 deletions
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 292e619db896..d9fb93451442 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -430,6 +430,16 @@ static void hidp_del_timer(struct hidp_session *session)
del_timer(&session->timer);
}
+static void hidp_process_report(struct hidp_session *session,
+ int type, const u8 *data, int len, int intr)
+{
+ if (len > HID_MAX_BUFFER_SIZE)
+ len = HID_MAX_BUFFER_SIZE;
+
+ memcpy(session->input_buf, data, len);
+ hid_input_report(session->hid, type, session->input_buf, len, intr);
+}
+
static void hidp_process_handshake(struct hidp_session *session,
unsigned char param)
{
@@ -502,7 +512,8 @@ static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
hidp_input_report(session, skb);
if (session->hid)
- hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 0);
+ hidp_process_report(session, HID_INPUT_REPORT,
+ skb->data, skb->len, 0);
break;
case HIDP_DATA_RTYPE_OTHER:
@@ -584,7 +595,8 @@ static void hidp_recv_intr_frame(struct hidp_session *session,
hidp_input_report(session, skb);
if (session->hid) {
- hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 1);
+ hidp_process_report(session, HID_INPUT_REPORT,
+ skb->data, skb->len, 1);
BT_DBG("report len %d", skb->len);
}
} else {
diff --git a/net/bluetooth/hidp/hidp.h b/net/bluetooth/hidp/hidp.h
index ab5241400cf7..8798492a6e99 100644
--- a/net/bluetooth/hidp/hidp.h
+++ b/net/bluetooth/hidp/hidp.h
@@ -24,6 +24,7 @@
#define __HIDP_H
#include <linux/types.h>
+#include <linux/hid.h>
#include <linux/kref.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/l2cap.h>
@@ -179,6 +180,9 @@ struct hidp_session {
/* Used in hidp_output_raw_report() */
int output_report_success; /* boolean */
+
+ /* temporary input buffer */
+ u8 input_buf[HID_MAX_BUFFER_SIZE];
};
/* HIDP init defines */