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netfilter: h323: bug in parsing of ASN1 SEQOF field

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Static analyzer of clang found a dead store which appears to be a bug in
reading count of items in SEQOF field, only the lower byte of word is
stored. This may lead to corrupted read and communication shutdown.

The bug has been in the module since it's first inclusion into linux
kernel.

[Patrick: the bug is real, but without practical consequence since the
 largest amount of sequence-of members we parse is 30.]

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
David Sterba 2011-04-04 15:21:02 +02:00 committed by Patrick McHardy
parent 2f9f28b212
commit b4232a2277
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_conntrack_h323_asn1.c
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@ -631,7 +631,7 @@ static int decode_seqof(bitstr_t *bs, const struct field_t *f,
CHECK_BOUND(bs, 2);
count = *bs->cur++;
count <<= 8;
count = *bs->cur++;
count += *bs->cur++;
break;
case SEMI:
BYTE_ALIGN(bs);