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Added bounds safety checking

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This commit is contained in:
Ryan Pavlik
2012-06-28 17:05:39 -05:00
parent 4d79373428
commit 0de7c661b7
2 changed files with 6 additions and 5 deletions
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5
src/classic.c
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@@ -49,6 +49,7 @@ static void classic_ctrl_pressed_buttons(struct classic_ctrl_t* cc, short now);
*
* @return Returns 1 if handshake was successful, 0 if not.
*/
#define HANDSHAKE_BYTES_USED 12
int classic_ctrl_handshake(struct wiimote_t* wm, struct classic_ctrl_t* cc, byte* data, unsigned short len) {
int i;
@@ -58,7 +59,7 @@ int classic_ctrl_handshake(struct wiimote_t* wm, struct classic_ctrl_t* cc, byte
cc->r_shoulder = 0;
cc->l_shoulder = 0;
if (data[0] == 0xFF) {
if (data[0] == 0xFF || len < HANDSHAKE_BYTES_USED) {
/*
* Sometimes the data returned here is not correct.
* This might happen because the wiimote is lagging
@@ -69,7 +70,7 @@ int classic_ctrl_handshake(struct wiimote_t* wm, struct classic_ctrl_t* cc, byte
* but since the next 16 bytes are the same, just use
* those.
*/
if (data[16] == 0xFF) {
if (len < 17 || len < HANDSHAKE_BYTES_USED + 16 || data[16] == 0xFF) {
/* get the calibration data */
byte* handshake_buf = (byte *)malloc(EXP_HANDSHAKE_LEN * sizeof(byte));