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Safeguard for invalid packets.

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This commit is contained in:
nvt-se 2007-10-04 10:02:08 +00:00
parent dfc0199cbd
commit 2d0225b0e4
1 changed files with 9 additions and 2 deletions
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11
platform/msb430/dev/cc1020.c
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@ -304,6 +304,7 @@ interrupt(UART0RX_VECTOR) cc1020_rxhandler(void)
uint16_t i2; uint16_t i2;
}; };
} shiftbuf; } shiftbuf;
static unsigned char pktlen;
switch (cc1020_rxstate) { switch (cc1020_rxstate) {
case CC1020_RX_SEARCHING: case CC1020_RX_SEARCHING:
@ -360,8 +361,14 @@ interrupt(UART0RX_VECTOR) cc1020_rxhandler(void)
} }
cc1020_rxlen++; cc1020_rxlen++;
if (cc1020_rxlen > HDRSIZE) { if (cc1020_rxlen == HDRSIZE) {
if (cc1020_rxlen == ((struct cc1020_header *)cc1020_rxbuf)->length) { pktlen = ((struct cc1020_header *)cc1020_rxbuf)->length;
if (pktlen == 0 || pktlen > sizeof (cc1020_rxbuf)) {
cc1020_rxlen = 0;
cc1020_rxstate = CC1020_RX_SEARCHING;
}
} else if (cc1020_rxlen > HDRSIZE) {
if (cc1020_rxlen == pktlen) {
// disable receiver // disable receiver
DISABLE_RX_IRQ(); DISABLE_RX_IRQ();
cc1020_rxstate = CC1020_RX_PROCESSING; cc1020_rxstate = CC1020_RX_PROCESSING;