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Fix out of bounds access in DHCID totext() method (#46001)

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(cherry picked from commit 98998f3ddd)
(cherry picked from commit 027a4a5b5d)
This commit is contained in:
Mukund Sivaraman 2017-09-19 19:30:28 +05:30
parent aaf04460a0
commit 71a86a75d9
2 changed files with 7 additions and 3 deletions
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3
CHANGES
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@ -1,3 +1,6 @@
4780. [bug] Fix out of bounds access in DHCID totext() method.
[RT #46001]
4729. [bug] Don't use memset() to wipe memory, as it may be
removed by compiler optimizations when the
memset() occurs on automatic stack allocation

7
lib/dns/rdata/in_1/dhcid_49.c
View file

@ -40,7 +40,7 @@ fromtext_in_dhcid(ARGS_FROMTEXT) {
static inline isc_result_t
totext_in_dhcid(ARGS_TOTEXT) {
isc_region_t sr;
isc_region_t sr, sr2;
char buf[sizeof(" ; 64000 255 64000")];
size_t n;
@ -49,6 +49,7 @@ totext_in_dhcid(ARGS_TOTEXT) {
REQUIRE(rdata->length != 0);
dns_rdata_toregion(rdata, &sr);
sr2 = sr;
if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
RETERR(str_totext("( " /*)*/, target));
@ -61,8 +62,8 @@ totext_in_dhcid(ARGS_TOTEXT) {
RETERR(str_totext(/* ( */ " )", target));
if (rdata->length > 2) {
n = snprintf(buf, sizeof(buf), " ; %u %u %u",
sr.base[0] * 256 + sr.base[1],
sr.base[2], rdata->length - 3);
sr2.base[0] * 256 + sr2.base[1],
sr2.base[2], rdata->length - 3);
INSIST(n < sizeof(buf));
RETERR(str_totext(buf, target));
}