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bsnmp: add asn1 message length validation

Browse source 
admbugs:	780
Submitted by:	Guido Vranken, bz
Reported by:	Guido Vranken
Security:	CVE-2019-5610
This commit is contained in:
Ed Maste 2019-08-06 16:09:06 +00:00
parent ab7de25c25
commit 54e9e4e72d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=350635
1 changed files with 5 additions and 0 deletions
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5
contrib/bsnmp/lib/asn1.c
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@ -100,6 +100,11 @@ asn_get_header(struct asn_buf *b, u_char *type, asn_len_t *len)
*len = *b->asn_cptr++;
b->asn_len--;
}
if (*len > b->asn_len) {
asn_error(b, "len %u exceeding asn_len %u", *len, b->asn_len);
return (ASN_ERR_EOBUF);
}
return (ASN_ERR_OK);
}