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Code Issues Releases Wiki Activity

WMBus: check message length for frametype A

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git-svn-id: https://svn.fhem.de/fhem/trunk@23789 2b470e98-0d58-463d-a4d8-8e2adae1ed80
This commit is contained in:
kaihs 2021-02-20 18:12:06 +00:00
parent d9124f1c63
commit 353c07e291
1 changed files with 5 additions and 4 deletions
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9
fhem/FHEM/WMBus.pm
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@ -2228,6 +2228,11 @@ sub decodeLinkLayer($$)
$self->{datablocks}++ if $self->{datalen} % LL_BLOCK_SIZE != 0; $self->{datablocks}++ if $self->{datalen} % LL_BLOCK_SIZE != 0;
$self->{msglen} = TL_BLOCK_SIZE + $self->{crc_size} + $self->{datalen} + $self->{datablocks} * $self->{crc_size}; $self->{msglen} = TL_BLOCK_SIZE + $self->{crc_size} + $self->{datalen} + $self->{datablocks} * $self->{crc_size};
if (length($self->{msg}) < $self->{msglen}) {
$self->{errormsg} = "message too short, expected " . $self->{msglen} . ", got " . length($self->{msg}) . " bytes";
$self->{errorcode} = ERR_MSG_TOO_SHORT;
return 0;
}
#printf("calc len %d, actual %d crc_size %d\n", $self->{msglen}, length($self->{msg}), $self->{crc_size}); #printf("calc len %d, actual %d crc_size %d\n", $self->{msglen}, length($self->{msg}), $self->{crc_size});
$self->{applicationlayer} = $self->removeCRC(substr($self->{msg},TL_BLOCK_SIZE + $self->{crc_size})); $self->{applicationlayer} = $self->removeCRC(substr($self->{msg},TL_BLOCK_SIZE + $self->{crc_size}));
return 0 if $self->{errorcode}; return 0 if $self->{errorcode};
@ -2279,10 +2284,6 @@ sub decodeLinkLayer($$)
if (length($self->{msg}) > $self->{msglen}) { if (length($self->{msg}) > $self->{msglen}) {
$self->{remainingData} = substr($self->{msg},$self->{msglen}); $self->{remainingData} = substr($self->{msg},$self->{msglen});
} elsif (length($self->{msg}) < $self->{msglen}) {
$self->{errormsg} = "message too short, expected " . $self->{msglen} . ", got " . length($self->{msg}) . " bytes";
$self->{errorcode} = ERR_MSG_TOO_SHORT;
return 0;
} }