kernel/git/stable/linux.git/net/mac80211/tx.c, branch master

wifi: mac80211: free ack status frame on TX header build failure

2026-07-06T12:11:07+00:00

ieee80211_build_hdr() stores an ACK status frame before it has finished all validation and header construction. If a later error path is taken, the transmit skb is freed but the stored ACK status frame remains in local->ack_status_frames. This can happen for control port frames when the requested MLO link ID does not match the link selected for a non-MLO station. Repeated failures can fill the ACK status IDR and leave pending ACK frames until hardware teardown. Remove any stored ACK status frame before returning an error after it has been inserted into the IDR. Fixes: a729cff8ad51 ("mac80211: implement wifi TX status") Cc: stable@vger.kernel.org Reported-by: Yuan Tan Reported-by: Yifan Wu Reported-by: Juefei Pu Reported-by: Xin Liu Assisted-by: Codex:gpt-5.4 Signed-off-by: Zhiling Zou Signed-off-by: Ren Wei Link: https://patch.msgid.link/9de0423da840e92084915b8f92e66a421245c4b8.1782462409.git.roxy520tt@gmail.com Signed-off-by: Johannes Berg

Merge tag 'wireless-next-2026-06-10' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next

2026-06-10T14:59:45+00:00

Johannes Berg says: ==================== Quite a few last updates, notably: - b43: new support for an 11n device - mt76: - mt792x broken usb transport detection - mt7921 regd improvements - mt7927 support - iwlwifi: - more kunit tests - FW version updates - ath12k: WDS support - rtw89: - RTL8922AU support - USB 3 mode switch for performance - better monitor radiotap support - RTL8922DE preparations - cfg80211/mac80211: - update UHR to D1.4, UHR DBE support - finally remove 5/10 MHz support - S1G rate reporting - multicast encapsulation offload * tag 'wireless-next-2026-06-10' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next: (285 commits) b43: add RF power offset for N-PHY r8 + radio 2057 r8 b43: add channel info table for N-PHY r8 + radio 2057 r8 b43: add IPA TX gain table for N-PHY r8 + radio 2057 r8 b43: support radio 2057 rev 8 b43: route d11 corerev 22 to 24-bit indirect radio access b43: add d11 core revision 0x16 to id table b43: add firmware mappings for rev22 rfkill: Replace strcpy() with memcpy() wifi: brcmfmac: flowring: simplify flow allocation wifi: brcm80211: change current_bss to value wifi: ath12k: enable IEEE80211_VHT_EXT_NSS_BW_CAPABLE when NSS ratio is reported wifi: ath12k: fix EAPOL TX failure caused by stale tcl_metadata bits wifi: ath: Update copyright in testmode_i.h wifi: ath10k: Update Qualcomm copyrights wifi: ath11k: Update Qualcomm copyrights wifi: ath12k: Update Qualcomm copyrights wifi: mt76: Drop unneeded mt76_register_debugfs_fops() return checks wifi: mt76: mt7921: assert sniffer on chanctx change wifi: mt76: mt7996: fix potential tx_retries underflow wifi: mt76: mt7925: fix potential tx_retries underflow ... ==================== Link: https://patch.msgid.link/20260610103637.179340-3-johannes@sipsolutions.net Signed-off-by: Jakub Kicinski

wifi: mac80211: Add 802.3 multicast encapsulation offload support

2026-06-05T14:12:26+00:00

mac80211 converts 802.3 multicast packets to 802.11 format before driver TX, even when Ethernet encapsulation offload is enabled. This prevents drivers that support multicast Ethernet encapsulation offload from receiving frames in native 802.3 format. Introduce the IEEE80211_OFFLOAD_ENCAP_MCAST flag to bypass the 802.11 encapsulation step and pass the multicast packet to the driver in 802.3 format. Drivers that support multicast Ethernet encapsulation offload can advertise this flag. Disable multicast encapsulation offload in MLO case for drivers not advertising MLO_MCAST_MULTI_LINK_TX support for AP mode and for 3-address AP_VLAN multicast packets. Signed-off-by: Tamizh Chelvam Raja Link: https://patch.msgid.link/20260604162403.1563729-4-tamizh.raja@oss.qualcomm.com [fix unlikely(), indentation] Signed-off-by: Johannes Berg

wifi: mac80211: Add multicast to unicast support for 802.3 path

2026-06-05T14:09:04+00:00

mac80211 already supports multicast-to-unicast conversion for native 802.11 TX paths, but this handling is missing for the 802.3 transmit path. Due to that the packet never converted to unicast and directly pass it to 802.11 Tx path by checking the destination address as multicast. Extend ieee80211_subif_start_xmit_8023() to honor the multicast_to_unicast setting by cloning and converting multicast Ethernet frames into per-station unicast transmissions, following the same behavior of the native 802.11 TX path and allow it to take 802.3 path. Signed-off-by: Tamizh Chelvam Raja Link: https://patch.msgid.link/20260604162403.1563729-3-tamizh.raja@oss.qualcomm.com Signed-off-by: Johannes Berg

wifi: mac80211: Add sta pointer sanity check in ieee80211_8023_xmit()

2026-06-05T14:09:04+00:00

Currently ieee80211_8023_xmit() accesses the sta pointer without any sanity check, assuming that only unicast packets for an authorized station are processed. But the sta pointer could become NULL when a framework to support 802.3 offload for the multicast packets is added in the follow-up patches. Add the valid sta pointer sanity check to avoid the invalid pointer access. This aligns with some of the subordinate functions called by ieee80211_8023_xmit() that already NULL-check 'sta' such as ieee80211_select_queue() and ieee80211_aggr_check(). Signed-off-by: Tamizh Chelvam Raja Link: https://patch.msgid.link/20260604162403.1563729-2-tamizh.raja@oss.qualcomm.com Signed-off-by: Johannes Berg

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2026-06-04T22:29:04+00:00

Cross-merge networking fixes after downstream PR (net-7.1-rc7). Silent conflicts: net/wireless/nl80211.c cb9959ab5f99 ("wifi: cfg80211: enforce HE/EHT cap/oper consistency") a384ae969902 ("wifi: cfg80211: move AP HT/VHT/... operation to beacon info") https://lore.kernel.org/aiGJDaHV4UlCexIQ@sirena.org.uk Conflicts: drivers/net/wireless/intel/iwlwifi/mld/ap.c a342c99cb70d ("wifi: iwlwifi: mld: honor BSS_CHANGED_BEACON_ENABLED") 9bf1b409afc7 ("wifi: iwlwifi: mld: send tx power constraints before link activation") https://lore.kernel.org/ah2bfedhV45ZxMO8@sirena.org.uk drivers/net/wireless/intel/iwlwifi/pcie/drv.c 093305d801fa ("wifi: iwlwifi: pcie: simplify the resume flow if fast resume is not used") e2323929a68a ("wifi: iwlwifi: pcie: add debug print for resume flow if powered off") https://lore.kernel.org/ah2bfedhV45ZxMO8@sirena.org.uk Adjacent changes: drivers/net/ethernet/airoha/airoha_eth.c b38cae85d1c4 ("net: airoha: Fix use-after-free in metadata dst teardown") ec6c391bcca7 ("net: airoha: Introduce airoha_gdm_dev struct") drivers/net/ethernet/microchip/lan743x_main.c 8173d22b211f ("net: lan743x: permit VLAN-tagged packets up to configured MTU") e3c6508a46f5 ("net: lan743x: avoid netdev-based logging before netdev registration") Signed-off-by: Jakub Kicinski

wifi: mac80211: fix monitor mode frame capture for real chanctx drivers

2026-06-04T11:04:10+00:00

Commit d594cc6f2c58 ("wifi: mac80211: restore non-chanctx injection behaviour") restored the monitor injection fallback for drivers using chanctx emulation but explicitly deferred drivers that transitioned to real chanctx ops. mt76 falls in that category and still drops every injected frame when monitor coexists with another interface. When the monitor has no chanctx of its own, fall back to the only chanctx in flight if there is exactly one. Refuse if multiple are present: picking arbitrarily would inject on an unrelated channel. Emulated and real chanctx drivers both flow through this fallback, since emulation always presents zero or one chanctx in local->chanctx_list. Reran the airgeddon evil-twin flow (hostapd AP + coexisting monitor VIF on the same phy + aireplay-ng deauth from the monitor) on mt7921e PCIe and mt7921u USB across 2.4 GHz and 5 GHz, and on a Kali VM with MT7921U passthrough as the closest match to the original reporter's setup. None reproduced the hang seen against the earlier attempt at this fix (<20251216111909.25076-2-johannes@sipsolutions.net>) or against v1 on lore in March. Cc: # causes some older drivers to crash Reported-by: Oscar Alfonso Diaz Closes: https://github.com/morrownr/USB-WiFi/issues/682 Tested-by: Devin Wittmayer Fixes: 0a44dfc07074 ("wifi: mac80211: simplify non-chanctx drivers") Signed-off-by: 傅继晗 Signed-off-by: Devin Wittmayer Link: https://patch.msgid.link/5c2760bd9bc34616bf7892848872522254dd1ce5.1780513445.git.lucid_duck@justthetip.ca Signed-off-by: Johannes Berg

wifi: mac80211: limit injected antenna index in ieee80211_parse_tx_radiotap

2026-06-02T11:26:33+00:00

When parsing the radiotap header of an injected frame, ieee80211_parse_tx_radiotap() uses the IEEE80211_RADIOTAP_ANTENNA value directly as a shift count: info->control.antennas |= BIT(*iterator.this_arg); *iterator.this_arg is an 8-bit value taken straight from the frame supplied by userspace, so BIT() can be asked to shift by up to 255. That is undefined behaviour on the unsigned long and is reported by UBSAN: UBSAN: shift-out-of-bounds in net/mac80211/tx.c:2174:30 shift exponent 235 is too large for 64-bit type 'unsigned long' Call Trace: ieee80211_parse_tx_radiotap+0xadb/0x1950 net/mac80211/tx.c:2174 ieee80211_monitor_start_xmit+0xb1f/0x1250 net/mac80211/tx.c:2451 ... packet_sendmsg+0x3eb6/0x50f0 net/packet/af_packet.c:3109 info->control.antennas is a 2-bit bitmap (u8 antennas:2), so only antenna indices 0 and 1 can ever be represented. Ignore any larger value instead of shifting out of bounds. Reported-by: syzbot+8e0622f6d9446420271f@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=8e0622f6d9446420271f Fixes: ef246a1480cc ("wifi: mac80211: support antenna control in injection") Signed-off-by: Deepanshu Kartikey Link: https://patch.msgid.link/20260531011721.102941-1-kartikey406@gmail.com Signed-off-by: Johannes Berg

wifi: mac80211: Fix a kernel panic in ieee80211_encrypt_tx_skb()

2026-05-05T10:10:15+00:00

skb->dev may be NULL for frames on non-netdev devices. For example, NAN device frames after pairing. Fix it. Signed-off-by: Andrei Otcheretianski Signed-off-by: Miri Korenblit Link: https://patch.msgid.link/20260504072055.1292999-2-miriam.rachel.korenblit@intel.com Signed-off-by: Johannes Berg

wifi: mac80211: allow userspace TX/RX over NAN Data interfaces

2026-05-05T10:10:14+00:00

Allow TX/RX of action frames (for NAN action frames) over NAN Data interfaces to support cases where there's a secure NDP and NAFs may be exchanged over that. Signed-off-by: Ilan Peer Signed-off-by: Miri Korenblit Link: https://patch.msgid.link/20260504101829.4ac207c60ebb.Ic4b1c90552497b7ff2616651a408e5fe8bde7b99@changeid Signed-off-by: Johannes Berg