2023-02-15 18:40:02 +00:00
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From: Felix Fietkau <nbd@nbd.name>
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Date: Wed, 15 Feb 2023 15:21:37 +0100
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Subject: [PATCH] wifi: mac80211: fix race in mesh sequence number
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assignment
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Since the sequence number is shared across different tx queues, it needs
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to be atomic in order to avoid accidental duplicate assignment
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/mac80211/ieee80211_i.h
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+++ b/net/mac80211/ieee80211_i.h
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2024-06-27 23:32:46 +00:00
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@@ -700,7 +700,7 @@ struct ieee80211_if_mesh {
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2023-02-15 18:40:02 +00:00
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struct mesh_stats mshstats;
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struct mesh_config mshcfg;
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atomic_t estab_plinks;
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- u32 mesh_seqnum;
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+ atomic_t mesh_seqnum;
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bool accepting_plinks;
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int num_gates;
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struct beacon_data __rcu *beacon;
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--- a/net/mac80211/mesh.c
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+++ b/net/mac80211/mesh.c
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@@ -752,10 +752,8 @@ unsigned int ieee80211_new_mesh_header(s
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meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
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- /* FIXME: racy -- TX on multiple queues can be concurrent */
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- put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
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- sdata->u.mesh.mesh_seqnum++;
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-
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+ put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
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+ &meshhdr->seqnum);
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if (addr4or5 && !addr6) {
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meshhdr->flags |= MESH_FLAGS_AE_A4;
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memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
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