REDHAT-BUG-2348592: Use After Free

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: MGMT: Fix slab-use-after-free Read in mgmtremoveadvmonitorsync

This fixes the following crash:

================================================================== BUG: KASAN: slab-use-after-free in mgmtremoveadvmonitorsync+0x3a/0xd0 net/bluetooth/mgmt.c:5543 Read of size 8 at addr ffff88814128f898 by task kworker/u9:4/5961

CPU: 1 UID: 0 PID: 5961 Comm: kworker/u9:4 Not tainted 6.12.0-syzkaller-10684-gf1cd565ce577 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: hci0 hcicmdsyncwork Call Trace: <TASK> dumpstack lib/dumpstack.c:94 [inline] dumpstacklvl+0x241/0x360 lib/dumpstack.c:120 printaddressdescription mm/kasan/report.c:378 [inline] printreport+0x169/0x550 mm/kasan/report.c:489 kasanreport+0x143/0x180 mm/kasan/report.c:602 mgmtremoveadvmonitorsync+0x3a/0xd0 net/bluetooth/mgmt.c:5543 hcicmdsyncwork+0x22b/0x400 net/bluetooth/hcisync.c:332 processonework kernel/workqueue.c:3229 [inline] processscheduledworks+0xa63/0x1850 kernel/workqueue.c:3310 workerthread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 retfromfork+0x4b/0x80 arch/x86/kernel/process.c:147 retfromforkasm+0x1a/0x30 arch/x86/entry/entry64.S:244 </TASK>

Allocated by task 16026: kasansavestack mm/kasan/common.c:47 [inline] kasansavetrack+0x3f/0x80 mm/kasan/common.c:68 poisonkmallocredzone mm/kasan/common.c:377 [inline] kasankmalloc+0x98/0xb0 mm/kasan/common.c:394 kasankmalloc include/linux/kasan.h:260 [inline] kmalloccachenoprof+0x243/0x390 mm/slub.c:4314 kmallocnoprof include/linux/slab.h:901 [inline] kzallocnoprof include/linux/slab.h:1037 [inline] mgmtpendingnew+0x65/0x250 net/bluetooth/mgmtutil.c:269 mgmtpendingadd+0x36/0x120 net/bluetooth/mgmtutil.c:296 removeadvmonitor+0x102/0x1b0 net/bluetooth/mgmt.c:5568 hcimgmtcmd+0xc47/0x11d0 net/bluetooth/hcisock.c:1712 hcisocksendmsg+0x7b8/0x11c0 net/bluetooth/hcisock.c:1832 socksendmsgnosec net/socket.c:711 [inline] socksendmsg+0x221/0x270 net/socket.c:726 sockwriteiter+0x2d7/0x3f0 net/socket.c:1147 newsyncwrite fs/readwrite.c:586 [inline] vfswrite+0xaeb/0xd30 fs/readwrite.c:679 ksyswrite+0x18f/0x2b0 fs/readwrite.c:731 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xf3/0x230 arch/x86/entry/common.c:83 entrySYSCALL64afterhwframe+0x77/0x7f

Freed by task 16022: kasansavestack mm/kasan/common.c:47 [inline] kasansavetrack+0x3f/0x80 mm/kasan/common.c:68 kasansavefreeinfo+0x40/0x50 mm/kasan/generic.c:582 poisonslabobject mm/kasan/common.c:247 [inline] kasanslabfree+0x59/0x70 mm/kasan/common.c:264 kasanslabfree include/linux/kasan.h:233 [inline] slabfreehook mm/slub.c:2338 [inline] slabfree mm/slub.c:4598 [inline] kfree+0x196/0x420 mm/slub.c:4746 mgmtpendingforeach+0xd1/0x130 net/bluetooth/mgmtutil.c:259 mgmtpoweroff+0x183/0x430 net/bluetooth/mgmt.c:9550 hcidevclosesync+0x6c4/0x11c0 net/bluetooth/hcisync.c:5208 hcidevdoclose net/bluetooth/hcicore.c:483 [inline] hcidevclose+0x112/0x210 net/bluetooth/hcicore.c:508 sockdoioctl+0x158/0x460 net/socket.c:1209 sockioctl+0x626/0x8e0 net/socket.c:1328 vfsioctl fs/ioctl.c:51 [inline] dosysioctl fs/ioctl.c:906 [inline] sesysioctl+0xf5/0x170 fs/ioctl.c:892 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xf3/0x230 arch/x86/entry/common.c:83 entrySYSCALL64afterhwframe+0x77/0x7f