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authorWANG Cong <xiyou.wangcong@gmail.com>2017-02-13 11:13:16 -0800
committerDavid S. Miller <davem@davemloft.net>2017-02-14 13:06:37 -0500
commitcd27b96bc13841ee7af25837a6ae86fee87273d6 (patch)
treeb0b7bbfad0aab8b7825f6bc259d7c1736e895e1f /net/kcm
parentnet: fec: fix multicast filtering hardware setup (diff)
downloadlinux-dev-cd27b96bc13841ee7af25837a6ae86fee87273d6.tar.xz
linux-dev-cd27b96bc13841ee7af25837a6ae86fee87273d6.zip
kcm: fix a null pointer dereference in kcm_sendmsg()
In commit 98e3862ca2b1 ("kcm: fix 0-length case for kcm_sendmsg()") I tried to avoid skb allocation for 0-length case, but missed a check for NULL pointer in the non EOR case. Fixes: 98e3862ca2b1 ("kcm: fix 0-length case for kcm_sendmsg()") Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/kcm')
-rw-r--r--net/kcm/kcmsock.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index 64f0e8531af0..a646f3481240 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1044,8 +1044,10 @@ wait_for_memory:
} else {
/* Message not complete, save state */
partial_message:
- kcm->seq_skb = head;
- kcm_tx_msg(head)->last_skb = skb;
+ if (head) {
+ kcm->seq_skb = head;
+ kcm_tx_msg(head)->last_skb = skb;
+ }
}
KCM_STATS_ADD(kcm->stats.tx_bytes, copied);