kernel/linux.git/net/wireless/scan.c, branch linux-7.1.y

wifi: fix leak if split 6 GHz scanning fails

2026-06-03T07:32:45+00:00

rdev->int_scan_req is leaked if cfg80211_scan() fails. Note that it's supposed to be released at ___cfg80211_scan_done() but this doesn't happen as rdev->scan_req is NULL at that point, too, leading to the early return from the freeing function. unreferenced object 0xffff8881161d0800 (size 512): comm "wpa_supplicant", pid 379, jiffies 4294749765 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 f0 81 13 16 81 88 ff ff ................ backtrace (crc c867fdb6): kmemleak_alloc+0x89/0x90 __kmalloc_noprof+0x2fd/0x410 cfg80211_scan+0x133/0x730 nl80211_trigger_scan+0xc69/0x1cc0 genl_family_rcv_msg_doit+0x204/0x2f0 genl_rcv_msg+0x431/0x6b0 netlink_rcv_skb+0x143/0x3f0 genl_rcv+0x27/0x40 netlink_unicast+0x4f6/0x820 netlink_sendmsg+0x797/0xce0 __sock_sendmsg+0xc4/0x160 ____sys_sendmsg+0x5e4/0x890 ___sys_sendmsg+0xf8/0x180 __sys_sendmsg+0x136/0x1e0 __x64_sys_sendmsg+0x76/0xc0 x64_sys_call+0x13f0/0x17d0 Found by Linux Verification Center (linuxtesting.org). Fixes: c8cb5b854b40 ("nl80211/cfg80211: support 6 GHz scanning") Signed-off-by: Fedor Pchelkin Link: https://patch.msgid.link/20260601094157.92703-1-pchelkin@ispras.ru Signed-off-by: Johannes Berg

wifi: cfg80211: advance loop vars in cfg80211_merge_profile()

2026-05-08T07:20:03+00:00

cfg80211_merge_profile() reassembles a Multi-BSSID non-transmitted BSS profile that has been split across multiple consecutive MBSSID elements. Its while-loop calls cfg80211_get_profile_continuation(ie, ielen, mbssid_elem, sub_elem) but never advances mbssid_elem or sub_elem inside the body. Each iteration therefore searches for a continuation that follows the same fixed pair; the helper returns the same next_mbssid; and the same next_sub bytes are memcpy()'d into merged_ie at a growing offset until the buffer fills. Advance both mbssid_elem and sub_elem to the just-consumed continuation so the next call to cfg80211_get_profile_continuation() searches for a further continuation beyond it (or returns NULL when none exists). A specially-crafted malicious beacon can take advantage of this bug to cause the kernel to spend an excessive amount of time in cfg80211_merge_profile (up to as much as 2ms per beacon received), which could theoretically be abused in some way. Cc: stable@vger.kernel.org Fixes: fe806e4992c9 ("cfg80211: support profile split between elements") Signed-off-by: John Walker Link: https://patch.msgid.link/20260507230720.64783-1-johnwalker0@gmail.com Signed-off-by: Johannes Berg

Convert 'alloc_flex' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This is the exact same thing as the 'alloc_obj()' version, only much smaller because there are a lot fewer users of the *alloc_flex() interface. As with alloc_obj() version, this was done entirely with mindless brute force, using the same script, except using 'flex' in the pattern rather than 'objs*'. Signed-off-by: Linus Torvalds

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

wifi: cfg80211: Fix use_for flag update on BSS refresh

2026-01-08T12:23:08+00:00

Userspace may fail to connect to certain BSS that were initially marked as unusable due to regulatory restrictions (use_for = 0, e.g., 6 GHz power type mismatch). Even after these restrictions are removed and the BSS becomes usable, connection attempts still fail. The issue occurs in cfg80211_update_known_bss() where the use_for flag is updated using bitwise AND (&=) instead of direct assignment. Once a BSS is marked with use_for = 0, the AND operation masks out any subsequent non-zero values, permanently keeping the flag at 0. This causes __cfg80211_get_bss(), invoked by nl80211_assoc_bss(), to fail the check "(bss->pub.use_for & use_for) != use_for", thereby blocking association. Replace the bitwise AND operation with direct assignment so the use_for flag accurately reflects the current BSS state. Fixes: d02a12b8e4bb ("wifi: cfg80211: add BSS usage reporting") Signed-off-by: Huang Chenming Link: https://patch.msgid.link/20251209025733.2098456-1-chenming.huang@oss.qualcomm.com Signed-off-by: Johannes Berg

wifi: cfg80211/mac80211: Add fallback mechanism for INDOOR_SP connection

2025-11-11T10:05:00+00:00

Implement fallback to LPI mode when SP mode is not permitted by regulatory constraints for INDOOR_SP connections. Limit fallback mechanism to client mode. Signed-off-by: Pagadala Yesu Anjaneyulu Reviewed-by: Johannes Berg Signed-off-by: Miri Korenblit Link: https://patch.msgid.link/20251110140806.8b43201a34ae.I37fc7bb5892eb9d044d619802e8f2095fde6b296@changeid Signed-off-by: Johannes Berg

wifi: cfg80211/mac80211: clean up duplicate ap_power handling

2025-11-11T10:05:00+00:00

Move duplicated ap_power type handling code to an inline function in cfg80211. Signed-off-by: Pagadala Yesu Anjaneyulu Reviewed-by: Johannes Berg Signed-off-by: Miri Korenblit Link: https://patch.msgid.link/20251110140806.959948da1cb5.I893b5168329fb3232f249c182a35c99804112da6@changeid Signed-off-by: Johannes Berg

Merge tag 'wireless-next-2025-09-11' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next

2025-09-12T00:50:46+00:00

Johannes Berg says: ==================== Plenty of things going on, notably: - iwlwifi: major cleanups/rework - brcmfmac: gets AP isolation support - mac80211: gets more S1G support * tag 'wireless-next-2025-09-11' of https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next: (94 commits) wifi: mwifiex: fix endianness handling in mwifiex_send_rgpower_table wifi: cfg80211: Remove the redundant wiphy_dev wifi: mac80211: fix incorrect comment wifi: cfg80211: update the time stamps in hidden ssid wifi: mac80211: Fix HE capabilities element check wifi: mac80211: add tx_handlers_drop statistics to ethtool wifi: mac80211: fix reporting of all valid links in sta_set_sinfo() wifi: iwlwifi: mld: CHANNEL_SURVEY_NOTIF is always supported wifi: iwlwifi: mld: remove support of iwl_esr_mode_notif version 1 wifi: iwlwifi: mld: remove support from of sta cmd version 1 wifi: iwlwifi: mld: remove support of roc cmd version 5 wifi: iwlwifi: mld: remove support of mac cmd ver 2 wifi: iwlwifi: mld: don't consider phy cmd version 5 wifi: iwlwifi: implement wowlan status notification API update wifi: iwlwifi: fw: Add ASUS to PPAG and TAS list wifi: iwlwifi: add kunit tests for nvm parse wifi: iwlwifi: api: add a flag to iwl_link_ctx_modify_flags wifi: iwlwifi: pcie: move ltr_enabled to the specific transport wifi: iwlwifi: pcie: move pm_support to the specific transport wifi: iwlwifi: rename iwl_finish_nic_init ... ==================== Link: https://patch.msgid.link/20250911100854.20445-3-johannes@sipsolutions.net Signed-off-by: Jakub Kicinski

wifi: cfg80211: update the time stamps in hidden ssid

2025-09-10T13:04:59+00:00

In hidden SSID we have separate BSS entries for the beacon and for the probe response(s). The BSS entry time stamps represent the age of the BSS; when was the last time we heard the BSS. When we receive a beacon of a hidden SSID it means that we heard that BSS, so it makes sense to indicate that in the probe response entries. Do that. Reviewed-by: Johannes Berg Signed-off-by: Miri Korenblit Link: https://patch.msgid.link/20250907115135.712745e498c0.I38186abf5d20dec6f6f2d42d2e1cdb50c6bfea25@changeid Signed-off-by: Johannes Berg

wifi: cfg80211: fix use-after-free in cmp_bss()

2025-08-26T11:45:09+00:00

Following bss_free() quirk introduced in commit 776b3580178f ("cfg80211: track hidden SSID networks properly"), adjust cfg80211_update_known_bss() to free the last beacon frame elements only if they're not shared via the corresponding 'hidden_beacon_bss' pointer. Reported-by: syzbot+30754ca335e6fb7e3092@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=30754ca335e6fb7e3092 Fixes: 3ab8227d3e7d ("cfg80211: refactor cfg80211_bss_update") Signed-off-by: Dmitry Antipov Link: https://patch.msgid.link/20250813135236.799384-1-dmantipov@yandex.ru Signed-off-by: Johannes Berg