[syzbot] [wireless?] memory leak in ieee80211_mesh_csa_beacon

[syzbot] [wireless?] memory leak in ieee80211_mesh_csa_beacon

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    bd5f485f3f02 Merge tag 'soc-arm-7.3' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16795679580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=82c3db8c83e3e016
dashboard link: https://syzkaller.appspot.com/bug?extid=f5752cd6b94fe38be666
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17913a25580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5cb73cc49d3d/disk-bd5f485f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dec5db798cfd/vmlinux-bd5f485f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7a15e3d5e4d/bzImage-bd5f485f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f5752cd6b94fe38be666@syzkaller.appspotmail.com

2026/08/19 20:15:25 executed programs: 5
BUG: memory leak
unreferenced object 0xffff88810a69b000 (size 1024):
  comm "syz.0.19", pid 5915, jiffies 4294944112
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    d8 23 c0 25 81 88 ff ff 00 00 00 00 00 00 00 00  .#.%............
  backtrace (crc 46b98ecb):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4597 [inline]
    slab_alloc_node mm/slub.c:4917 [inline]
    __kmalloc_cache_noprof+0x359/0x440 mm/slub.c:5485
    _kmalloc_noprof include/linux/slab.h:988 [inline]
    ieee80211_mesh_csa_beacon+0x2e/0x100 net/mac80211/mesh.c:1547
    ieee80211_set_csa_beacon net/mac80211/cfg.c:4674 [inline]
    __ieee80211_channel_switch+0xb22/0xed0 net/mac80211/cfg.c:4795
    rdev_channel_switch net/wireless/rdev-ops.h:1168 [inline]
    nl80211_channel_switch+0x39b/0x780 net/wireless/nl80211.c:12234
    genl_family_rcv_msg_doit+0x12e/0x1a0 net/netlink/genetlink.c:1114
    genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
    genl_rcv_msg+0x302/0x440 net/netlink/genetlink.c:1209
    netlink_rcv_skb+0x89/0x1c0 net/netlink/af_netlink.c:2556
    genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
    netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
    netlink_unicast+0x38f/0x4e0 net/netlink/af_netlink.c:1345
    netlink_sendmsg+0x335/0x690 net/netlink/af_netlink.c:1900
    sock_sendmsg_nosec net/socket.c:800 [inline]
    __sock_sendmsg net/socket.c:815 [inline]
    ____sys_sendmsg+0x54a/0x580 net/socket.c:2709
    ___sys_sendmsg+0x101/0x140 net/socket.c:2763
    __sys_sendmsg+0xcd/0x140 net/socket.c:2795
    do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
    do_syscall_64+0xe9/0x530 arch/x86/entry/syscall_64.c:84
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
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Re: [syzbot] [wireless?] memory leak in ieee80211_mesh_csa_beacon

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+f5752cd6b94fe38be666@syzkaller.appspotmail.com
Tested-by: syzbot+f5752cd6b94fe38be666@syzkaller.appspotmail.com

Tested on:

commit:         0a0d1d55 Merge tag 'scftorture.2026.08.18a' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11a26415580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e9cd457924935cdf
dashboard link: https://syzkaller.appspot.com/bug?extid=f5752cd6b94fe38be666
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11642625580000

Note: testing is done by a robot and is best-effort only.