[git commit branch/1_28_stable] ip: fix crash in "ip neigh show"
Denys Vlasenko
vda.linux at googlemail.com
Wed Feb 14 16:38:40 UTC 2018
commit: https://git.busybox.net/busybox/commit/?id=f5b9a2267803bcb1dad5e902dcdfeefb65a112c3
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/1_28_stable
parse_rtattr() was using tb[] array without initializing it.
Based on patch by Balaji Punnuru <balaji_punnuru at cable.comcast.com>
function old new delta
parse_rtattr 85 107 +22
print_route 1630 1617 -13
print_linkinfo 807 794 -13
iproute_get 835 822 -13
print_rule 680 665 -15
ll_remember_index 263 248 -15
print_addrinfo 1223 1197 -26
ipaddr_list_or_flush 1253 1223 -30
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/7 up/down: 22/-125) Total: -103 bytes
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
networking/libiproute/ipaddress.c | 6 +++---
networking/libiproute/ipneigh.c | 10 ++++++----
networking/libiproute/iproute.c | 4 ++--
networking/libiproute/iprule.c | 2 +-
networking/libiproute/libnetlink.c | 2 ++
networking/libiproute/ll_map.c | 2 +-
networking/tc.c | 22 +++++++++++++---------
7 files changed, 28 insertions(+), 20 deletions(-)
diff --git a/networking/libiproute/ipaddress.c b/networking/libiproute/ipaddress.c
index 921ecf0d9..d7f888176 100644
--- a/networking/libiproute/ipaddress.c
+++ b/networking/libiproute/ipaddress.c
@@ -113,7 +113,7 @@ static NOINLINE int print_linkinfo(const struct nlmsghdr *n)
if (G_filter.up && !(ifi->ifi_flags & IFF_UP))
return 0;
- memset(tb, 0, sizeof(tb));
+ //memset(tb, 0, sizeof(tb)); - parse_rtattr does this
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (tb[IFLA_IFNAME] == NULL) {
bb_error_msg("nil ifname");
@@ -227,7 +227,7 @@ static int FAST_FUNC print_addrinfo(const struct sockaddr_nl *who UNUSED_PARAM,
if (G_filter.flushb && n->nlmsg_type != RTM_NEWADDR)
return 0;
- memset(rta_tb, 0, sizeof(rta_tb));
+ //memset(rta_tb, 0, sizeof(rta_tb)); - parse_rtattr does this
parse_rtattr(rta_tb, IFA_MAX, IFA_RTA(ifa), n->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)));
if (!rta_tb[IFA_LOCAL])
@@ -535,7 +535,7 @@ int FAST_FUNC ipaddr_list_or_flush(char **argv, int flush)
continue;
if (G_filter.pfx.family || G_filter.label) {
struct rtattr *tb[IFA_MAX+1];
- memset(tb, 0, sizeof(tb));
+ //memset(tb, 0, sizeof(tb)); - parse_rtattr does this
parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), IFA_PAYLOAD(n));
if (!tb[IFA_LOCAL])
tb[IFA_LOCAL] = tb[IFA_ADDRESS];
diff --git a/networking/libiproute/ipneigh.c b/networking/libiproute/ipneigh.c
index 1cd90d707..f572414e9 100644
--- a/networking/libiproute/ipneigh.c
+++ b/networking/libiproute/ipneigh.c
@@ -110,11 +110,13 @@ static int FAST_FUNC print_neigh(const struct sockaddr_nl *who UNUSED_PARAM,
return 0;
if (G_filter.index && G_filter.index != r->ndm_ifindex)
return 0;
- if (!(G_filter.state&r->ndm_state) &&
- !(r->ndm_flags & NTF_PROXY) &&
- (r->ndm_state || !(G_filter.state & 0x100)) &&
- (r->ndm_family != AF_DECnet))
+ if (!(G_filter.state&r->ndm_state)
+ && !(r->ndm_flags & NTF_PROXY)
+ && (r->ndm_state || !(G_filter.state & 0x100))
+ && (r->ndm_family != AF_DECnet)
+ ) {
return 0;
+ }
parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
diff --git a/networking/libiproute/iproute.c b/networking/libiproute/iproute.c
index 95dafe183..2a8610ea6 100644
--- a/networking/libiproute/iproute.c
+++ b/networking/libiproute/iproute.c
@@ -83,7 +83,7 @@ static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
if (len < 0)
bb_error_msg_and_die("wrong nlmsg len %d", len);
- memset(tb, 0, sizeof(tb));
+ //memset(tb, 0, sizeof(tb)); - parse_rtattr does this
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
#if HAVE_RTA_TABLE
@@ -1081,7 +1081,7 @@ static int iproute_get(char **argv)
bb_error_msg_and_die("wrong len %d", len);
}
- memset(tb, 0, sizeof(tb));
+ //memset(tb, 0, sizeof(tb)); - parse_rtattr does this
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
if (tb[RTA_PREFSRC]) {
diff --git a/networking/libiproute/iprule.c b/networking/libiproute/iprule.c
index 53b11e16c..0ce0dfeef 100644
--- a/networking/libiproute/iprule.c
+++ b/networking/libiproute/iprule.c
@@ -63,7 +63,7 @@ static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
if (len < 0)
return -1;
- memset(tb, 0, sizeof(tb));
+ //memset(tb, 0, sizeof(tb)); - parse_rtattr does this
parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
if (r->rtm_family == AF_INET)
diff --git a/networking/libiproute/libnetlink.c b/networking/libiproute/libnetlink.c
index 3f0f70326..f08d862d0 100644
--- a/networking/libiproute/libnetlink.c
+++ b/networking/libiproute/libnetlink.c
@@ -401,6 +401,8 @@ int FAST_FUNC rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data
void FAST_FUNC parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
{
+ memset(tb, 0, (max + 1) * sizeof(tb[0]));
+
while (RTA_OK(rta, len)) {
if (rta->rta_type <= max) {
tb[rta->rta_type] = rta;
diff --git a/networking/libiproute/ll_map.c b/networking/libiproute/ll_map.c
index be88a04e8..66401da77 100644
--- a/networking/libiproute/ll_map.c
+++ b/networking/libiproute/ll_map.c
@@ -51,7 +51,7 @@ int FAST_FUNC ll_remember_index(const struct sockaddr_nl *who UNUSED_PARAM,
if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
return -1;
- memset(tb, 0, sizeof(tb));
+ //memset(tb, 0, sizeof(tb)); - parse_rtattr does this
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
if (tb[IFLA_IFNAME] == NULL)
return 0;
diff --git a/networking/tc.c b/networking/tc.c
index 23abf636c..284c93098 100644
--- a/networking/tc.c
+++ b/networking/tc.c
@@ -57,17 +57,21 @@
/* nullifies tb on error */
#define __parse_rtattr_nested_compat(tb, max, rta, len) \
- ({if ((RTA_PAYLOAD(rta) >= len) && \
- (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr))) { \
- rta = RTA_DATA(rta) + RTA_ALIGN(len); \
- parse_rtattr_nested(tb, max, rta); \
- } else \
- memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); \
- })
+({ \
+ if ((RTA_PAYLOAD(rta) >= len) \
+ && (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) \
+ ) { \
+ rta = RTA_DATA(rta) + RTA_ALIGN(len); \
+ parse_rtattr_nested(tb, max, rta); \
+ } else \
+ memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); \
+})
#define parse_rtattr_nested_compat(tb, max, rta, data, len) \
- ({data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
- __parse_rtattr_nested_compat(tb, max, rta, len); })
+({ \
+ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
+ __parse_rtattr_nested_compat(tb, max, rta, len); \
+})
#define show_details (0) /* not implemented. Does anyone need it? */
#define use_iec (0) /* not currently documented in the upstream manpage */
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