netdev - [PATCH 4/4] xfrm: ipcomp: remove unnecessary get

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Message-ID: <20210423081409.729557-5-steffen.klassert@secunet.com>
Date:   Fri, 23 Apr 2021 10:14:09 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH 4/4] xfrm: ipcomp: remove unnecessary get_cpu()

From: Sabrina Dubroca <sd@...asysnail.net>

While testing ipcomp on a realtime kernel, Xiumei reported a "sleeping
in atomic" bug, caused by a memory allocation while preemption is
disabled (ipcomp_decompress -> alloc_page -> ... get_page_from_freelist).

As Sebastian noted [1], this get_cpu() isn't actually needed, since
ipcomp_decompress() is called in napi context anyway, so BH is already
disabled.

This patch replaces get_cpu + per_cpu_ptr with this_cpu_ptr, then
simplifies the error returns, since there isn't any common operation
left.

[1] https://lore.kernel.org/lkml/20190820082810.ixkmi56fp7u7eyn2@linutronix.de/

Cc: Juri Lelli <jlelli@...hat.com>
Reported-by: Xiumei Mu <xmu@...hat.com>
Suggested-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_ipcomp.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
index 4d422447aadc..2e8afe078d61 100644
--- a/net/xfrm/xfrm_ipcomp.c
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -41,19 +41,16 @@ static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
 	const int plen = skb->len;
 	int dlen = IPCOMP_SCRATCH_SIZE;
 	const u8 *start = skb->data;
-	const int cpu = get_cpu();
-	u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
-	struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
+	u8 *scratch = *this_cpu_ptr(ipcomp_scratches);
+	struct crypto_comp *tfm = *this_cpu_ptr(ipcd->tfms);
 	int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
 	int len;
 
 	if (err)
-		goto out;
+		return err;
 
-	if (dlen < (plen + sizeof(struct ip_comp_hdr))) {
-		err = -EINVAL;
-		goto out;
-	}
+	if (dlen < (plen + sizeof(struct ip_comp_hdr)))
+		return -EINVAL;
 
 	len = dlen - plen;
 	if (len > skb_tailroom(skb))
@@ -68,16 +65,14 @@ static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
 		skb_frag_t *frag;
 		struct page *page;
 
-		err = -EMSGSIZE;
 		if (WARN_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS))
-			goto out;
+			return -EMSGSIZE;
 
 		frag = skb_shinfo(skb)->frags + skb_shinfo(skb)->nr_frags;
 		page = alloc_page(GFP_ATOMIC);
 
-		err = -ENOMEM;
 		if (!page)
-			goto out;
+			return -ENOMEM;
 
 		__skb_frag_set_page(frag, page);
 
@@ -96,11 +91,7 @@ static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
 		skb_shinfo(skb)->nr_frags++;
 	}
 
-	err = 0;
-
-out:
-	put_cpu();
-	return err;
+	return 0;
 }
 
 int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
-- 
2.25.1