This is a note to let you know that I've just added the patch titled
ping: prevent NULL pointer dereference on write to msg_name
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ping-prevent-null-pointer-dereference-on-write-to-msg_name.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Thu Dec 5 16:16:39 PST 2013
From: Hannes Frederic Sowa <[email protected]>
Date: Mon, 18 Nov 2013 07:07:45 +0100
Subject: ping: prevent NULL pointer dereference on write to msg_name
From: Hannes Frederic Sowa <[email protected]>
[ Upstream commit cf970c002d270c36202bd5b9c2804d3097a52da0 ]
A plain read() on a socket does set msg->msg_name to NULL. So check for
NULL pointer first.
Signed-off-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ipv4/ping.c | 34 +++++++++++++++++++---------------
1 file changed, 19 insertions(+), 15 deletions(-)
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -867,11 +867,13 @@ int ping_recvmsg(struct kiocb *iocb, str
if (family == AF_INET) {
struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
- sin->sin_family = AF_INET;
- sin->sin_port = 0 /* skb->h.uh->source */;
- sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
- memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
- *addr_len = sizeof(*sin);
+ if (sin) {
+ sin->sin_family = AF_INET;
+ sin->sin_port = 0 /* skb->h.uh->source */;
+ sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+ memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+ *addr_len = sizeof(*sin);
+ }
if (isk->cmsg_flags)
ip_cmsg_recv(msg, skb);
@@ -883,16 +885,18 @@ int ping_recvmsg(struct kiocb *iocb, str
struct sockaddr_in6 *sin6 =
(struct sockaddr_in6 *)msg->msg_name;
- sin6->sin6_family = AF_INET6;
- sin6->sin6_port = 0;
- sin6->sin6_addr = ip6->saddr;
- sin6->sin6_flowinfo = 0;
- if (np->sndflow)
- sin6->sin6_flowinfo = ip6_flowinfo(ip6);
-
- sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
- IP6CB(skb)->iif);
- *addr_len = sizeof(*sin6);
+ if (sin6) {
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = 0;
+ sin6->sin6_addr = ip6->saddr;
+ sin6->sin6_flowinfo = 0;
+ if (np->sndflow)
+ sin6->sin6_flowinfo = ip6_flowinfo(ip6);
+ sin6->sin6_scope_id =
+ ipv6_iface_scope_id(&sin6->sin6_addr,
+ IP6CB(skb)->iif);
+ *addr_len = sizeof(*sin6);
+ }
if (inet6_sk(sk)->rxopt.all)
pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb);
Patches currently in stable-queue which might be from
[email protected] are
queue-3.12/ipv6-fix-inet6_init-cleanup-order.patch
queue-3.12/ipv6-fix-headroom-calculation-in-udp6_ufo_fragment.patch
queue-3.12/ping-prevent-null-pointer-dereference-on-write-to-msg_name.patch
queue-3.12/inet-prevent-leakage-of-uninitialized-memory-to-user-in-recv-syscalls.patch
queue-3.12/net-rework-recvmsg-handler-msg_name-and-msg_namelen-logic.patch
queue-3.12/ipv6-fix-possible-seqlock-deadlock-in-ip6_finish_output2.patch
queue-3.12/net-add-bug_on-if-kernel-advertises-msg_namelen-sizeof-struct-sockaddr_storage.patch
queue-3.12/ipv6-use-rt6_get_dflt_router-to-get-default-router-in.patch
queue-3.12/random32-fix-off-by-one-in-seeding-requirement.patch
queue-3.12/inet-fix-possible-seqlock-deadlocks.patch
queue-3.12/inet-fix-addr_len-msg-msg_namelen-assignment-in-recv_error-and-rxpmtu-functions.patch
queue-3.12/ipv6-protect-for_each_sk_fl_rcu-in-mem_check-with.patch
queue-3.12/ipv6-fix-leaking-uninitialized-port-number-of-offender-sockaddr.patch
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