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40 lines
1.2 KiB
Diff
40 lines
1.2 KiB
Diff
From foo@baz Thu Feb 23 21:13:05 CET 2017
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From: WANG Cong <xiyou.wangcong@gmail.com>
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Date: Mon, 13 Feb 2017 11:13:16 -0800
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Subject: kcm: fix a null pointer dereference in kcm_sendmsg()
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From: WANG Cong <xiyou.wangcong@gmail.com>
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[ Upstream commit cd27b96bc13841ee7af25837a6ae86fee87273d6 ]
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In commit 98e3862ca2b1 ("kcm: fix 0-length case for kcm_sendmsg()")
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I tried to avoid skb allocation for 0-length case, but missed
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a check for NULL pointer in the non EOR case.
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Fixes: 98e3862ca2b1 ("kcm: fix 0-length case for kcm_sendmsg()")
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Reported-by: Dmitry Vyukov <dvyukov@google.com>
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Cc: Tom Herbert <tom@herbertland.com>
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Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
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Acked-by: Tom Herbert <tom@herbertland.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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net/kcm/kcmsock.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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--- a/net/kcm/kcmsock.c
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+++ b/net/kcm/kcmsock.c
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@@ -1044,8 +1044,10 @@ wait_for_memory:
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} else {
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/* Message not complete, save state */
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partial_message:
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- kcm->seq_skb = head;
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- kcm_tx_msg(head)->last_skb = skb;
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+ if (head) {
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+ kcm->seq_skb = head;
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+ kcm_tx_msg(head)->last_skb = skb;
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+ }
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}
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KCM_STATS_ADD(kcm->stats.tx_bytes, copied);
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