diff options
| author | Sabrina Dubroca <sd@queasysnail.net> | 2021-04-16 18:11:46 +0300 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2021-04-19 13:49:29 +0300 |
| commit | 747b67088f8d34b3ec64d31447a1044be92dd348 (patch) | |
| tree | 67a3a9e9fd18a48a8270fc903a4f62a50b1f3be4 /net/xfrm | |
| parent | 6218fe186109b93a2fa2343e13981e016e9961ab (diff) | |
| download | linux-747b67088f8d34b3ec64d31447a1044be92dd348.tar.xz | |
xfrm: ipcomp: remove unnecessary get_cpu()
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@redhat.com>
Reported-by: Xiumei Mu <xmu@redhat.com>
Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_ipcomp.c | 25 |
1 files 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) |