* [PATCH] mac80211: fix mesh forwarding when ratelimited too [not found] ` <201012262159.oBQLxOsw008865@hera.kernel.org> @ 2010-12-30 8:01 ` Milton Miller 2010-12-30 8:53 ` Johannes Berg 0 siblings, 1 reply; 2+ messages in thread From: Milton Miller @ 2010-12-30 8:01 UTC (permalink / raw) To: John W. Linville, Johannes Berg, Javier Cardona Cc: David S. Miller, linux-wireless, netdev, linux-kernel Commit b51aff057c9d0ef6c529dc25fd9f775faf7b6c63 said: Under memory pressure, the mac80211 mesh code may helpfully print a message that it failed to clone a mesh frame and then will proceed to crash trying to use it anyway. Fix that. Avoid the reference whenever the frame copy is unsuccessful regardless of the debug message being suppressed or printed. Cc: stable@kernel.org [2.6.27+] Signed-off-by: Milton Miller <miltonm@bga.com> --- I chose a seperate if vs nesting the ratelimit check to avoid shifting the printk further to the right. diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index b01e467..e98668f 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1788,11 +1788,11 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) fwd_skb = skb_copy(skb, GFP_ATOMIC); - if (!fwd_skb && net_ratelimit()) { + if (!fwd_skb && net_ratelimit()) printk(KERN_DEBUG "%s: failed to clone mesh frame\n", sdata->name); + if (!fwd_skb) goto out; - } fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); ^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] mac80211: fix mesh forwarding when ratelimited too 2010-12-30 8:01 ` [PATCH] mac80211: fix mesh forwarding when ratelimited too Milton Miller @ 2010-12-30 8:53 ` Johannes Berg 0 siblings, 0 replies; 2+ messages in thread From: Johannes Berg @ 2010-12-30 8:53 UTC (permalink / raw) To: Milton Miller Cc: John W. Linville, Javier Cardona, David S. Miller, linux-wireless, netdev, linux-kernel On Thu, 2010-12-30 at 02:01 -0600, Milton Miller wrote: > Commit b51aff057c9d0ef6c529dc25fd9f775faf7b6c63 said: > > Under memory pressure, the mac80211 mesh code > may helpfully print a message that it failed > to clone a mesh frame and then will proceed > to crash trying to use it anyway. Fix that. > > Avoid the reference whenever the frame copy is unsuccessful > regardless of the debug message being suppressed or printed. > > Cc: stable@kernel.org [2.6.27+] > Signed-off-by: Milton Miller <miltonm@bga.com> > --- > I chose a seperate if vs nesting the ratelimit check to avoid shifting > the printk further to the right. > > diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c > index b01e467..e98668f 100644 > --- a/net/mac80211/rx.c > +++ b/net/mac80211/rx.c > @@ -1788,11 +1788,11 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) > > fwd_skb = skb_copy(skb, GFP_ATOMIC); > > - if (!fwd_skb && net_ratelimit()) { > + if (!fwd_skb && net_ratelimit()) > printk(KERN_DEBUG "%s: failed to clone mesh frame\n", > sdata->name); > + if (!fwd_skb) > goto out; > - } Oops, good catch! Thanks. johannes ^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-12-30 8:01 ` [PATCH] mac80211: fix mesh forwarding when ratelimited too Milton Miller
2010-12-30 8:53 ` Johannes Berg
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