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Treat an all-zeros message as bad.

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This commit is contained in:
Oliver Jowett 2015-06-29 00:45:33 +01:00
parent 75851778c0
commit 803760ca80
1 changed files with 4 additions and 0 deletions
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4
mode_s.c
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@ -333,6 +333,7 @@ int scoreModesMessage(unsigned char *msg, int validbits)
int msgtype, msgbits, crc, iid; int msgtype, msgbits, crc, iid;
uint32_t addr; uint32_t addr;
struct errorinfo *ei; struct errorinfo *ei;
static unsigned char all_zeros[14] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
if (validbits < 56) if (validbits < 56)
return -2; return -2;
@ -343,6 +344,9 @@ int scoreModesMessage(unsigned char *msg, int validbits)
if (validbits < msgbits) if (validbits < msgbits)
return -2; return -2;
if (!memcmp(all_zeros, msg, msgbits/8))
return -2;
crc = modesChecksum(msg, msgbits); crc = modesChecksum(msg, msgbits);
switch (msgtype) { switch (msgtype) {