[PATCH 4.2.y-ckt 255/268] connector: bump skb->users before callback invocation
From: Kamal Mostafa <hidden>
Date: 2016-01-27 20:43:36
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Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
4.2.8-ckt3 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Florian Westphal <fw@strlen.de> [ Upstream commit 55285bf09427c5abf43ee1d54e892f352092b1f1 ] Dmitry reports memleak with syskaller program. Problem is that connector bumps skb usecount but might not invoke callback. So move skb_get to where we invoke the callback. Reported-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Kamal Mostafa <redacted> --- drivers/connector/connector.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index 30f5228..c19e7fc 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c@@ -178,26 +178,21 @@ static int cn_call_callback(struct sk_buff *skb) * * It checks skb, netlink header and msg sizes, and calls callback helper. */ -static void cn_rx_skb(struct sk_buff *__skb) +static void cn_rx_skb(struct sk_buff *skb) { struct nlmsghdr *nlh; - struct sk_buff *skb; int len, err; - skb = skb_get(__skb); - if (skb->len >= NLMSG_HDRLEN) { nlh = nlmsg_hdr(skb); len = nlmsg_len(nlh); if (len < (int)sizeof(struct cn_msg) || skb->len < nlh->nlmsg_len || - len > CONNECTOR_MAX_MSG_SIZE) { - kfree_skb(skb); + len > CONNECTOR_MAX_MSG_SIZE) return; - } - err = cn_call_callback(skb); + err = cn_call_callback(skb_get(skb)); if (err < 0) kfree_skb(skb); }
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1.9.1